The USA is one of the most prolific nations in the Olympics. What factors have led to this dominance?

Populous and rich. See also: China

Money. Sports is big money in the USA.

Money/resources.

Propaganda.

Since I was downvoted, i.e. we pumped a lot of money into our Olympics teams to win as many medals as possible as a sign of strength, to use as propaganda. As did the soviets.

College sports.

Glowy