What was Americas best allies in world war 2?

America's primary allies in World War II were the United Kingdom, the Soviet Union, and China, forming the core of the Allied Powers. The UK contributed significantly to the war effort in Europe, while the Soviet Union played a crucial role on the Eastern Front after being invaded by Germany in 1941. China was engaged in a prolonged struggle against Japanese forces, which was pivotal in the Pacific theater. Together, these nations collaborated to defeat the Axis Powers, which included Germany, Italy, and Japan.