Answer:
By the Cold War.
Explanation:
After WWII, America and the Soviet Union knew they were BOTH international superpowers based on their success in defeating the Axis powers with nuclear weapons. Knowing this, the Soviets began expanding what I believe was south/east, and America felt threatened (somehow) to this process. So the non-violent "war" known as the Cold War (because the Soviet Union was cold and so is the USA) began.
I recommend the channel "Oversimplified" for further explanation.
(Before you ask, I do not sponsor "Oversimplified" or any channel for that matter.)
It serves as one of the three branches through which all the powers of the government are shared and dispersed equally. Does this help?
I would say that in 1900, Great Britain controlled more territory than any other nation mentioned including India, and many parts of Africa and some countries in the Middle East like Palestine (after WWI). That is why it was said that "the sun never rises or sets on the British Empire.
Congress(idk if im right but ehhh try it)
It was very successful for short time relief. It changed the country by restoring prosperity to Americans. Although it didn’t end the Great Depression the new programs just made the public have confidence.