How are Americans so successful at the Olympics?

I was looking at up the history of the Olympics, and I was absolutely shocked to see that your country has the most gold medals in the Summer Olympics (more than 2000 and more than twice the amount of the next country) and in the Winter Olympics you are second only to Norway in Gold Medals. Historically, how has your country managed to achieve this? You don't even pay your Olympians, like for example the old Soviet Union and China give their athletes stipends so that they don't do anything except train for the Olympics. Some of your Olympic gold medalists, like the Women's water polo team in the 2024 Olympics, even had to beg for sponsorship through instagram! Historically, how has American dominated the Olympics so thoroughly?