Andrew Johnson was the 17th President of the United States,
following the assassination of President Abraham Lincoln. He
was in office from 1865 until 1869. Johnson was the first  U.S.
President to be impeached. Most political historians rated him
as being among the worst of this countries presidents.

An artists illustration of Johnson’s impeachment trial in the United
States Senate.

Woodrow Wilson was the 28th President of the United States. He 
was in office from March 4, 1913 to march 4, 1921.

The Louisiana Purchase was completed when France turned
New Orleans over to the United States.

The United States Air Force terminated Project Blue Book, a series
of studies of Unidentified Flying Object (UFO) sightings, after it was determined that there was no evidence of extraterrestrial spaceship
activity behind thousands of reports. The project, which started in
1952, ceased all activity in January of 1970.