Presidents' Day Facts
Presidents' Day falls on the third Monday in February in the United States. It is also known as Washington's Birthday, after George Washington, the first president of the United States. The day is meant to celebrate George Washington and all the presidents of the U.S. It became a federal holiday in 1879. Although there was an attempt in 1968 to officially call the third Monday in February Presidents' Day, it failed. It eventually came to pass that in 1971. Still many states choose to call this day Presidents' Day instead of Washington's Birthday. Some states also celebrate Abraham Lincoln's birthday at this time as well.
(Source: http://www.softschools.com/facts/holidays/presidents_day_facts/157/