On this day, April 22 ...

2000: In a pre-dawn raid, armed immigration agents seize Elian Gonzalez, a Cuban boy at the center of a custody dispute, from his relatives’ home in Miami; he is reunited with his father at Andrews Air Force Base near Washington.

Also on this day:

1864: Congress authorizes the use of the phrase “In God We Trust” on U.S. coins.

1898: Congress authorizes creation of the 1st U.S. Volunteer Cavalry, also known as the “Rough Riders.”

Congress authorizes creation of the 1st U.S. Volunteer Cavalry, also known as the “Rough Riders.” 1915: The first full-scale use of deadly chemicals in warfare takes place as German forces unleash chlorine gas against Allied troops at the start of the Second Battle of Ypres in Belgium during World War I; thousands of soldiers are believed to have died.

The first full-scale use of deadly chemicals in warfare takes place as German forces unleash chlorine gas against Allied troops at the start of the Second Battle of Ypres in Belgium during World War I; thousands of soldiers are believed to have died. 1952: An atomic test in Nevada becomes the first nuclear explosion shown on live network television as a 31-kiloton bomb is dropped from a B-50 Superfortress.

1954: The publicly televised sessions of the Senate Army-McCarthy hearings begin.

1970: Millions of Americans concerned about the environment observe the first Earth Day.

Millions of Americans concerned about the environment observe the first Earth Day. 1993: The U.S. Holocaust Memorial Museum is dedicated in Washington, D.C., to honor victims of Nazi extermination.