History: Black And White City Photography, United States

While most major U.S. sports have evolved out of European practices, basketball, volleyball, skateboarding, snowboarding, and cheerleading are American inventions. Lacrosse and surfing arose from Native American and Native Hawaiian activities that predate Western contact. Eight Olympic Games have taken place in the United States. The United States has won 2,301 medals at the Summer Olympic Games, more than any other country, and 253 in the Winter Olympic Games, the second most.
Measurement systems
The country retains United States customary units, constituted largely by British imperial units such as yards, miles, and degrees Fahrenheit. Distinct units include the U.S. gallon and pint volume measurements. The United States is one of three countries, along with Burma and Liberia, that has not officially adopted the metric system. However, metric units are increasingly used in science, medicine, and many industrial fields.