1. On January 20, 1820, a treaty was signed between the United States and Spain, known as the Adams-Onís Treaty, which granted Florida to the United States. The treaty also led to the official recognition of the Sabine River as the boundary between Louisiana and Texas.

2. January 20, 1961 was an important date for Florida as it marked the inauguration of John F. Kennedy, the 35th President of the United States. Kennedy vacationed in Florida frequently and the state was an important part of his campaign strategy.

3. On January 20, 1986, the space shuttle Challenger exploded 73 seconds after takeoff, killing all seven crew members on board. The disaster had a profound impact on NASA and the nation as a whole, and led to an overhaul of the space program.

4. On January 20, 2001, George W. Bush was inaugurated as the 43rd President of the United States. Bush's brother, Jeb, served as the Governor of Florida at the time and played a key role in delivering the state to his brother during the contentious 2000 election.

5. In 2017, thousands of Floridians participated in the Women's March on Washington, held on January 20 to coincide with the inauguration of Donald Trump. The event was one of the largest protests in U.S. history and saw millions of people take to the streets in cities across the country.