What country has been the most successful in the Olympics since the 1900's?

As of the 2008 Games, since the modern Olympics began in 1896, the United States has won the most gold medals (896) and total medals (2191) in the Summer Olympics. The Soviet Union/Russia is second in both gold (395) and total (1010) medals. Since the Winter Olympics began, Norway has won the most gold (98) and total (280) medals in the Winter Games. The United States and Soviet Union/Russia are tied for second most gold medals (78) and the US is second in total medals (216) and the Soviet Union/Russia is third (194).