In 1865, four people were hanged in Washington, D.C., for conspiring with John Wilkes Booth to assassinate President Abraham Lincoln.

In 1898, the United States annexed Hawaii.

In 1908, the Democratic national convention, which nominated William Jennings Bryan for president, opened in Denver.

In 1919, the first Transcontinental Motor Convoy, in which a U.S. Army convoy of motorized vehicles crossed the United States, departed Washington, D.C. (The trip ended in San Francisco on Sept. 6, 1919.)

In 1930, construction began on Boulder Dam (later Hoo...

Log-In to view full story or view our Registration Guide.