1) The most-watched television event in the United States is the Super Bowl, with millions of viewers tuning in each year.

2) The Mona Lisa, painted by Leonardo da Vinci, is one of the most famous and valuable artworks in the world.

3) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.

4) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.