21. US flag
The current iteration of the American flag was designed by a high school student.
22. Second Amendment
There are more guns than people in the United States — about 101 for every 100 people, according to some estimates. The country with the next highest ownership rate is Serbia, where there are 58 guns for every 100 people.
23. German influence
Approximately 43 million Americans identify as ancestrally German, more than any other nationality.
24. Imperial system of measurement
The United States is one of only three countries that have not officially switched to the metric system. Liberia and Burma are the other two.
25. Job tenure
The typical wage or salary worker in the United States has been with his or her current employer for 4.2 years.
