In 1970, the first Earth Day was observed in the United States. Above, Patterson High School students do their part by picketing garbage dumps at Kane Street and North Point Boulevard. (William H. Mortimer, Baltimore Sun file photo, 1970)
1864: Congress authorized the use of the phrase "In God We Trust" on U.S. coins.
1889: The Oklahoma Land Rush began at noon as thousands of homesteaders staked claims.
1898: Congress authorized creation of the 1st U.S. Volunteer Cavalry, popularly known as the "Rough Riders."
1930: The United States, Britain and Japan signed the London Naval Treaty, which regulated submarine warfare and limited shipbuilding.