The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.
Railroads brought crops and food to cities in the East, and settlers to farms in the Great Plains
Nikolai Novikov was the Soviet Ambassador to the United States in 1946-1947 and he prepared his telegram for Stalin and Molotov.
Balance of power is talking about the legislative, judicial, and executive branch which were all made to keep each other "balanced out" where they can check other branches and make sure that decisions being made aren't "unconstitutional" so that there wouldn't be one person with total power that could lead to a dictatorship.