President Donald Trump just passed the 100-day mark of his administration. Where did the 100-day benchmark come from and what does it really mean? Read our five interesting "100 Day" Presidential facts.

The 100 days measurement began after Franklin Delano Roosevelt entered office during the chaos of the Great Depression.

Read about FDR's first 100 days here.

President John F. Kennedy ordered the failed Bay of Pigs invasion 87 days into his term.

Read about the Bay of Pigs invasion here.

President Ronald Reagan was shot in the chest on the 69th day of his presidency and had to sign his first bill into law while still in the hospital.

George W. Bush, said his first 100-day assessment should be delayed because of the recount of ballots from the Florida race.

Learn more about the 2000 election and the Florida recount here.

The Trump administration is hoping its first 100 days isn't marred by a government shutdown.

Looks like the shutdown crisis is averted for now. The White House just announced that the first 100 days of Donald Trump's president have been a "historic success." Only time will tell. Go to whitehouse.gov and read more.