• The Colonial Era 1600 - 1750
• The Revolutionary Era 1751 - 1776
  
• The Critical Period 1777 - 1789
• The Early National Era 1790 - 1800
• The Jeffersonian Era 1800 - 1828
• The Antebellum Era 1829 - 1860
• The Civil War Era 1860 - 1866
• The Gilded Age 1867 - 1890
• The Progressive Era 1890 - 1913
  
• World War I 1914 - 1918
• The Interwar Era 1918 - 1939
  
• World War II 1939 - 1945
  
• The Postwar Era 1945 - 1960
• The Opposition Age 1960 - 1980
• The Technology Era 1980 - 1998
• The Global Era 1998 - Now
  

The nine rules are:

1. Capitalize the first word in a sentence. 
2. Capitalize the pronoun I and the interjection O.
3. Capitalize the first word in a quotation.
4. Capitalize the first word in a direct question falling within a sentence.
5. Capitalize all nouns referring to deity and to the Bible and other sacred books
6. Use a capital for President and Presidency when referring to the office of the President of the United States
7. Capitalize official titles before the name of the official
8. Capitalize proper nouns and adjectives formed from proper nouns
9. Capitalize every word, except conjunctions, articles and short prepositions in the titles of books, music, art, etc