diff --git a/create_defs.rb b/create_defs.rb
index ffc26f3..547d28d 100644
--- a/create_defs.rb
+++ b/create_defs.rb
@@ -1,9 +1,9 @@
 require 'yaml'
 
-module_name = 'CA'
+module_name = 'NorthAmerica'
 
 # Load the data files
-files = ['data/ca.yaml', 'data/common_methods.yaml']
+files = ['data/ca.yaml', 'data/mx.yaml', 'data/us.yaml', 'data/common_methods.yaml', 'data/north_america_informal.yaml']
 regions = []
 rules_by_month = {}
 custom_methods = {}
@@ -28,13 +28,13 @@ files.each do |file|
         exists = false
         rules_by_month[month].each do |ex|
           if ex['name'] == rule['name'] and ex['wday'] == rule['wday'] and  ex['mday'] == rule['mday'] and ex['week'] == rule['week']
-#            ex['regions'] << rule['regions'].flatten
+            ex['regions'] << rule['regions'].flatten
             exists = true
           end
         end
-        #unless exists
+        unless exists
           rules_by_month[month] << rule
-        #end
+        end
 
       end # /defs.each
     end
diff --git a/data/au.yaml b/data/au.yaml
new file mode 100644
index 0000000..6999a50
--- /dev/null
+++ b/data/au.yaml
@@ -0,0 +1,76 @@
+# Australian holiday definitions for the Ruby Holiday gem.
+# Updated: 2008-11-21.
+# Source:  http://en.wikipedia.org/wiki/Australian_public_holidays
+--- 
+months:
+  0: 
+  - name: Good Friday
+    regions: [au]
+    function: lambda { |year| easter(year)-2 }
+  - name: Easter Saturday
+    regions: [au]
+    function: lambda { |year| easter(year)-1 }
+  - name: Easter Monday
+    regions: [au]
+    function: lambda { |year| easter(year)+1 }
+  - name: Easter Monday
+    regions: [au_tas]
+    function: lambda { |year| easter(year)+2 }
+  1: 
+  - name: New Year's Day
+    regions: [au]
+    mday: 1
+  - name: Australia Day
+    regions: [au]
+    mday: 26
+  3: 
+  - name: Labour Day
+    regions: [au_wa]
+    week: 1
+    wday: 1
+  - name: Labour Day
+    regions: [au_vic, au_tas]
+    week: 2
+    wday: 1
+  4: 
+  - name: ANZAC Day
+    regions: [au]
+    mday: 25
+  5: 
+  - name: Labour Day
+    regions: [au_qld, au_nt]
+    week: 1
+    wday: 1
+  6: 
+  - name: Queen's Birthday
+    regions: [au]
+    week: 2
+    wday: 1
+  - name: Queensland Day
+    regions: [au_qld]
+    mday: 6
+    type: informal
+  10: 
+  - name: Labour Day
+    regions: [au_act, au_nsw, au_sa]
+    week: 1
+    wday: 1
+  12: 
+  - name: Christmas Day
+    regions: [au]
+    mday: 25
+  - name: Boxing Day
+    regions: [au]
+    mday: 26
+methods:
+  ca_victoria_day: |
+    # Monday on or before May 24
+    def self.ca_victoria_day(year)
+      date = Date.civil(year,5,24)
+      if date.wday > 1
+        date -= (date.wday - 1)
+      elsif date.wday == 0
+        date -= 6
+      end
+      date
+    end
\ No newline at end of file
diff --git a/data/mx.yaml b/data/mx.yaml
index db1e0ed..7042fac 100644
--- a/data/mx.yaml
+++ b/data/mx.yaml
@@ -1,56 +1,57 @@
 # Mexican holiday definitions for the Ruby Holiday gem.
 # Updated 2008-11-21.
 --- 
-0: 
-- name: Good Thursday
-  regions: [mx]
-  function: lambda { |year| easter(year)-3 }
-- name: Good Friday
-  regions: [mx]
-  function: lambda { |year| easter(year)-2 }
-- name: Easter Sunday
-  regions: [mx]
-  function: lambda { |year| easter(year) }
-1: 
-- name: New Year's Day
-  regions: [mx]
-  mday: 1
-- name: New Year's Day
-  regions: [mx]
-  mday: 2
-2: 
-- name: D\xC3\xADa de la Constituci\xC3\xB3n
-  week: 1
-  regions: [mx]
-  wday: 1
-3: 
-- name: Natalicio de Benito Ju\xC3\xA1rez
-  week: 3
-  regions: [mx]
-  wday: 1
-5: 
-- name: D\xC3\xADa del Trabajo
-  regions: [mx]
-  mday: 1
-- name: La Batalla de Puebla
-  regions: [mx]
-  mday: 5
-9: 
-- name: D\xC3\xADa de Independencia
-  regions: [mx]
-  mday: 16
-11: 
-- name: Dia de Muertos
-  regions: [mx]
-  mday: 2
-- name: D\xC3\xADa de la Revoluci\xC3\xB3n
-  week: 3
-  regions: [mx]
-  wday: 1
-12: 
-- name: Our Lady of Guadalupe's day
-  regions: [mx]
-  mday: 12
-- name: Christmas Day
-  regions: [mx]
-  mday: 25
+months:
+  0: 
+  - name: Good Thursday
+    regions: [mx]
+    function: lambda { |year| easter(year)-3 }
+  - name: Good Friday
+    regions: [mx]
+    function: lambda { |year| easter(year)-2 }
+  - name: Easter Sunday
+    regions: [mx]
+    function: lambda { |year| easter(year) }
+  1: 
+  - name: New Year's Day
+    regions: [mx]
+    mday: 1
+  - name: New Year's Day
+    regions: [mx]
+    mday: 2
+  2: 
+  - name: D\xC3\xADa de la Constituci\xC3\xB3n
+    week: 1
+    regions: [mx]
+    wday: 1
+  3: 
+  - name: Natalicio de Benito Ju\xC3\xA1rez
+    week: 3
+    regions: [mx]
+    wday: 1
+  5: 
+  - name: D\xC3\xADa del Trabajo
+    regions: [mx]
+    mday: 1
+  - name: La Batalla de Puebla
+    regions: [mx]
+    mday: 5
+  9: 
+  - name: D\xC3\xADa de Independencia
+    regions: [mx]
+    mday: 16
+  11: 
+  - name: Dia de Muertos
+    regions: [mx]
+    mday: 2
+  - name: D\xC3\xADa de la Revoluci\xC3\xB3n
+    week: 3
+    regions: [mx]
+    wday: 1
+  12: 
+  - name: Our Lady of Guadalupe's day
+    regions: [mx]
+    mday: 12
+  - name: Christmas Day
+    regions: [mx]
+    mday: 25
diff --git a/data/north_america_informal.yaml b/data/north_america_informal.yaml
new file mode 100644
index 0000000..e51e062
--- /dev/null
+++ b/data/north_america_informal.yaml
@@ -0,0 +1,54 @@
+# Informal North American holiday definitions for the Ruby Holiday gem.
+# Updated 2008-11-22.
+--- 
+months:
+  0: 
+  - name: Good Friday
+    regions: [us]
+    function: lambda { |year| easter(year)-2 }
+    type: informal
+  2: 
+  - name: Groundhog Day
+    regions: [us, ca]
+    mday: 2
+    type: informal
+  - name: Valentine's Day
+    regions: [us, ca]
+    mday: 14
+    type: informal
+  3: 
+  - name: St. Patrick's Day
+    regions: [us, ca]
+    mday: 17
+    type: informal
+  4: 
+  - name: April Fool's Day
+    regions: [us, ca]
+    mday: 1
+    type: informal
+  - name: Earth Day
+    regions: [us, ca]
+    mday: 22
+    type: informal
+  5: 
+  - name: Mother's Day
+    week: 2
+    regions: [us, ca]
+    wday: 0
+    type: informal
+  - name: Armed Forces Day
+    week: 3
+    regions: [us]
+    wday: 6
+    type: informal
+  5: 
+  - name: Father's Day
+    week: 3
+    regions: [us, ca]
+    wday: 0
+    type: informal
+  10: 
+  - name: Halloween
+    regions: [us, ca]
+    mday: 31
+    type: informal
diff --git a/data/us.yaml b/data/us.yaml
index d11d119..1334303 100644
--- a/data/us.yaml
+++ b/data/us.yaml
@@ -1,47 +1,59 @@
 # United States holiday definitions for the Ruby Holiday gem.
-# Updated 2008-11-21.
+#
+# Updated: 2008-11-22.
+# Source:  http://en.wikipedia.org/wiki/Public_holidays_of_the_United_States
 --- 
-1: 
-- name: New Year's Day
-  regions: [us]
-  mday: 1
-- name: Martin Luther King, Jr. Day
-  week: 3
-  regions: [us]
-  wday: 1
-3: 
-- name: George Washington's Birthday
-  week: 3
-  regions: [us]
-  wday: 1
-5: 
-- name: Memorial Day
-  week: -1
-  regions: [us]
-  wday: 1
-6: 
-- name: Flag Day
-  regions: [us]
-  mday: 14
-7: 
-- name: Independence Day
-  regions: [us]
-  mday: 4
-9: 
-- name: Labor Day
-  week: 1
-  regions: [us]
-  wday: 1
-11: 
-- name: Veterans Day
-  regions: [us]
-  mday: 11
-- name: Thanksgiving Day
-  week: 4
-  regions: [us]
-  wday: 4
-12: 
-- name: Christmas Day
-  regions: [us]
-  mday: 25
-  wday: 
\ No newline at end of file
+months:
+  1: 
+  - name: New Year's Day
+    regions: [us]
+    mday: 1
+  - name: Martin Luther King, Jr. Day
+    week: 3
+    regions: [us]
+    wday: 1
+  - name: Inauguration Day
+    function: lambda { |year| us_inauguration_day(year) }
+    regions: [us]
+  3: 
+  - name: Presidents' Day
+    week: 3
+    regions: [us]
+    wday: 1
+  5: 
+  - name: Memorial Day
+    week: -1
+    regions: [us]
+    wday: 1
+  7: 
+  - name: Independence Day
+    regions: [us]
+    mday: 4
+  9: 
+  - name: Labor Day
+    week: 1
+    regions: [us]
+    wday: 1
+  10: 
+  - name: Columbus Day
+    week: 2
+    regions: [us]
+    wday: 1
+  11: 
+  - name: Veterans Day
+    regions: [us]
+    mday: 11
+  - name: Thanksgiving Day
+    week: 4
+    regions: [us]
+    wday: 4
+  12: 
+  - name: Christmas Day
+    regions: [us]
+    mday: 25
+methods:
+  us_inauguration_day: |
+    # January 20, every fourth year, following Presidential election
+    def self.us_inauguration_day(year)
+      year % 4 == 1 ? 20 : nil
+    end
\ No newline at end of file
diff --git a/lib/holidays/north_america.rb b/lib/holidays/north_america.rb
new file mode 100644
index 0000000..e3cfe2e
--- /dev/null
+++ b/lib/holidays/north_america.rb
@@ -0,0 +1,137 @@
+module Holidays
+  # This file is generated by the Ruby Holiday gem.
+  #
+  # Definitions loaded: data/ca.yaml, data/mx.yaml, data/us.yaml, data/common_methods.yaml, data/north_america_informal.yaml
+  #
+  # To use the definitions in the file, load them right after you load the 
+  # Holiday gem:
+  #
+  #   require 'holidays'
+  #   require 'path/to/northamerica'
+  #
+  # More definitions are available at http://code.dunae.ca/holidays.
+  module NorthAmerica # :nodoc:
+    DEFINED_REGIONS = [:ca, :ca_qc, :mx, :us, :ca_nf, :ca_nt, :ca_nu, :ca_ab, :ca_on, :ca_sk, :ca_mb, :ca_bc, :ca_ns, :ca_yk]
+    
+    HOLIDAYS_BY_MONTH = {
+      5 => [{:function => lambda { |year| ca_victoria_day(year) }, :name => "Victoria Day", :regions => [:ca]},
+            {:function => lambda { |year| ca_victoria_day(year) }, :name => "National Patriotes Day", :regions => [:ca_qc]},
+            {:mday => 1, :name => "D\xC3\xADa del Trabajo", :regions => [:mx]},
+            {:mday => 5, :name => "La Batalla de Puebla", :regions => [:mx]},
+            {:wday => 1, :week => -1, :name => "Memorial Day", :regions => [:us]},
+            {:wday => 0, :week => 3, :name => "Father's Day", :regions => [:us, :ca]}],
+      0 => [{:function => lambda { |year| easter(year)-2 }, :name => "Good Friday", :regions => [:ca, :mx, :us]},
+            {:function => lambda { |year| easter(year)+1 }, :name => "Easter Monday", :regions => [:ca_qc]},
+            {:function => lambda { |year| easter(year)-3 }, :name => "Good Thursday", :regions => [:mx]},
+            {:function => lambda { |year| easter(year) }, :name => "Easter Sunday", :regions => [:mx]}],
+      11 => [{:mday => 11, :name => "Rememberance Day", :regions => [:ca]},
+            {:mday => 2, :name => "Dia de Muertos", :regions => [:mx]},
+            {:wday => 1, :week => 3, :name => "D\xC3\xADa de la Revoluci\xC3\xB3n", :regions => [:mx]},
+            {:mday => 11, :name => "Veterans Day", :regions => [:us]},
+            {:wday => 4, :week => 4, :name => "Thanksgiving Day", :regions => [:us]}],
+      6 => [{:mday => 24, :name => "Discovery Day", :regions => [:ca_nf]},
+            {:mday => 24, :name => "Fête Nationale", :regions => [:ca_qc]},
+            {:mday => 21, :name => "National Aboriginal Day", :regions => [:ca_nt]}],
+      1 => [{:mday => 1, :name => "New Year's Day", :regions => [:ca, :mx, :us]},
+            {:mday => 2, :name => "New Year's", :regions => [:ca_qc]},
+            {:mday => 2, :name => "New Year's Day", :regions => [:mx]},
+            {:wday => 1, :week => 3, :name => "Martin Luther King, Jr. Day", :regions => [:us]},
+            {:function => lambda { |year| us_inauguration_day(year) }, :name => "Inauguration Day", :regions => [:us]}],
+      12 => [{:mday => 25, :name => "Christmas Day", :regions => [:ca, :mx, :us]},
+            {:mday => 26, :name => "Boxing Day", :regions => [:ca]},
+            {:mday => 12, :name => "Our Lady of Guadalupe's day", :regions => [:mx]}],
+      7 => [{:mday => 1, :name => "Canada Day", :regions => [:ca]},
+            {:mday => 12, :name => "Orangemen's Day", :regions => [:ca_nf]},
+            {:mday => 9, :name => "Nunavut Day", :regions => [:ca_nu]},
+            {:mday => 4, :name => "Independence Day", :regions => [:us]}],
+      2 => [{:wday => 1, :week => 3, :name => "Family Day", :regions => [:ca_ab, :ca_on, :ca_sk]},
+            {:wday => 1, :week => 3, :name => "Louis Riel Day", :regions => [:ca_mb]},
+            {:wday => 1, :week => 1, :name => "D\xC3\xADa de la Constituci\xC3\xB3n", :regions => [:mx]},
+            {:mday => 2, :name => "Groundhog Day", :regions => [:us, :ca]},
+            {:mday => 14, :name => "Valentine's Day", :regions => [:us, :ca]}],
+      8 => [{:wday => 1, :week => 1, :name => "BC Day", :regions => [:ca_bc]},
+            {:wday => 1, :week => 1, :name => "Saskatchewan Day", :regions => [:ca_sk]},
+            {:wday => 1, :week => 1, :name => "Heritage Day", :regions => [:ca_ab]},
+            {:wday => 1, :week => 1, :name => "Natal Day", :regions => [:ca_ns]},
+            {:wday => 1, :week => 1, :name => "Civic Holiday", :regions => [:ca_on]},
+            {:wday => 1, :week => 3, :name => "Discovery Day", :regions => [:ca_yk]}],
+      3 => [{:mday => 23, :name => "St. George's Day", :regions => [:ca_nf]},
+            {:wday => 1, :week => 3, :name => "Natalicio de Benito Ju\xC3\xA1rez", :regions => [:mx]},
+            {:wday => 1, :week => 3, :name => "Presidents' Day", :regions => [:us]},
+            {:mday => 17, :name => "St. Patrick's Day", :regions => [:us, :ca]}],
+      9 => [{:wday => 1, :week => 1, :name => "Labour Day", :regions => [:ca]},
+            {:mday => 16, :name => "D\xC3\xADa de Independencia", :regions => [:mx]},
+            {:wday => 1, :week => 1, :name => "Labor Day", :regions => [:us]}],
+      4 => [{:mday => 1, :name => "April Fool's Day", :regions => [:us, :ca]},
+            {:mday => 22, :name => "Earth Day", :regions => [:us, :ca]}],
+      10 => [{:wday => 1, :week => 2, :name => "Thanksgiving", :regions => [:ca]},
+            {:wday => 1, :week => 2, :name => "Columbus Day", :regions => [:us]},
+            {:mday => 31, :name => "Halloween", :regions => [:us, :ca]}]
+    }
+
+# Get the date of Easter in a given year.
+#
+# +year+ must be a valid Gregorian year.
+#
+# Returns a Date object.
+#--
+# from http://snippets.dzone.com/posts/show/765
+# TODO: check year to ensure Gregorian
+def self.easter(year)
+  y = year
+  a = y % 19
+  b = y / 100
+  c = y % 100
+  d = b / 4
+  e = b % 4
+  f = (b + 8) / 25
+  g = (b - f + 1) / 3
+  h = (19 * a + b - d - g + 15) % 30
+  i = c / 4
+  k = c % 4
+  l = (32 + 2 * e + 2 * i - h - k) % 7
+  m = (a + 11 * h + 22 * l) / 451
+  month = (h + l - 7 * m + 114) / 31
+  day = ((h + l - 7 * m + 114) % 31) + 1
+  Date.civil(year, month, day)
+end
+
+
+# Monday on or before May 24
+def self.ca_victoria_day(year)
+  date = Date.civil(year,5,24)
+  if date.wday > 1
+    date -= (date.wday - 1)
+  elsif date.wday == 0
+    date -= 6
+  end
+  date
+end
+
+# January 20, every fourth year, following Presidential election
+def self.us_inauguration_day(year)
+  year % 4 == 1 ? 20 : nil
+end
+
+
+  end
+end
+
+Holidays.class_eval do
+  existing_regions = []
+  if const_defined?(:DEFINED_REGIONS) 
+    existing_regions = const_get(:DEFINED_REGIONS)
+    remove_const(:DEFINED_REGIONS)
+  end
+  const_set(:DEFINED_REGIONS, existing_regions | Holidays::NorthAmerica::DEFINED_REGIONS)
+
+  existing_defs = {}
+  if const_defined?(:HOLIDAYS_BY_MONTH) 
+    existing_defs = const_get(:HOLIDAYS_BY_MONTH)
+    remove_const(:HOLIDAYS_BY_MONTH)
+  end
+  #const_set(:HOLIDAYS_BY_MONTH, existing_defs.merge(Holidays::NorthAmerica::HOLIDAYS_BY_MONTH))
+  const_set(:HOLIDAYS_BY_MONTH, Holidays::NorthAmerica::HOLIDAYS_BY_MONTH)
+
+  include Holidays::NorthAmerica
+end
diff --git a/rakefile.rb b/rakefile.rb
index ee7b3f1..890e6d0 100644
--- a/rakefile.rb
+++ b/rakefile.rb
@@ -14,6 +14,11 @@ Rake::TestTask.new do |t|
   t.verbose = false
 end
 
+task :build_defs do
+  puts ARGV
+  puts ARGV[1]
+end
+
 
 desc 'Generate documentation.'
 Rake::RDocTask.new(:rdoc) do |rdoc|