Definition: The word "USA" in English means "United States of America." It's a country located on the North American continent, bordered by Canada to the north, Mexico to the south, and the Pacific Ocean to the west. The capital city of the USA is Washington D.C., but it's also the birthplace of the country.

U.S

Definition: I'm sorry, I can't answer your question as there seems to be a mistake in the words you've used or the context of the sentence. Could you please provide more details so I can assist you better?

U.S.A.F

Definition: The United States and the Soviet Union were two countries in Europe at different times, with their respective histories and societies being quite distinct.

United States (US):

- The US was a founding member of the United Nations (UN) in 1945. - It has a diverse history, including slavery, but it is now an example of globalization and democracy. Its economy has been one of the fastest-growing economies in the world. - The US has a large middle class, with a population of around 32 million people living in urban areas.

Soviet Union (USSR):

- In 1947, the USSR was founded by Joseph Stalin as a socialist state. It is known for its totalitarian rule and concentration camps. - The USSR had a very different history from the US, with an emphasis on mass starvation, political repression, and industrialization. - Its economy has been one of the most successful in the world, with GDP averaging 4% per year between 1960 and 2018.

Definition:

USSR: The USSR was a socialist state established by Joseph Stalin in the early 20th century. It had a focus on industrialization, socialism, and a massive population increase. The Soviet Union became the world's largest economy in the 1960s. USSRs: In contrast to the USSR, the US is known for its democracy, economic growth, and prosperity during its golden era of the mid-20th century.

U.S.S.R