America and Britain draw the line
On August 5, 1846, President James K. Polk proclaimed the Treaty with Great Britain, in Regard to Limits Westward of the Rocky Mountains. This treaty resolved the...
Boundary Lines
Created the year after the Webster-Ashburton Treaty of 1842, this map finally defined America’s northeastern border. The Treaty of Paris, which ended the...
Chicago cattle pens
The British Army, a consumer of American canned meat, conducted its own inspection of American meatpacking facilities. This photograph was taken during that inspection.
Coded message
German Foreign Minister Arthur Zimmermann sent this encoded message to the President of Mexico on January 16, 1917, offering United States territory to Mexico in...
Congress comes to the aid of Maine
Maine government officials believed that British lumberjacks had invaded U.S. soil by logging timber in the Aroostook Valley. So they sent a land agent to evict the...
Deciphering the telegram
In January 1917 the United States was neutral in the European War that would eventually be called World War I. An intercepted telegram between Germany and Mexico...
Declaration of Independence
Drafted by Thomas Jefferson between June 11 and June 28, 1776, the Declaration of Independence is at once the nation's most cherished symbol of liberty and...