Encyclopedias, Almanacs, Transcripts, and Maps
- The Philippine War
- The President's Plan for Reconstruction
- The Promise of Freedom
- The Prosperity Decade, 1921–1928 (Overview)
- The Protestant Reformation
- The Radical Republicans Clash with the President
- The Radical Republicans Move Forward with Reconstruction
- The Reconstruction Governments
- The Revolution Begins: Steam Engines, Railroads, and Steamboats
- The Rifled Musket
- The Rise of Monarchies: France, England, and Spain
- The Rise of Rome (3rd century bce to 2nd century ce
- The Rise of Silas Lapham
- The Robber Barons
- The Sangallo Family
- The Second Phase of the Industrial Revolution: 1850–1940
- The Second Retreat of the United Nations Command
- The Second Term
- The Secretariat
- The Secretary-General