The Feudal System was familiarized to England following the attacked and victory of the country by William I (The Conqueror). The system of feudalism was used by the Normans in the France. In this system all the land was under the control of the King and he was the one who owned all the land.
The king further used to divide the land between personal and other uses. One fourth of the total land was kept by the owner/king for his personal use/property while some was given to the church and the rest was rent out under strict controls.
Answer:
Tensions between the United States and the Soviet Union began almost exactly or even before World War Two ended. Now, events like The Soviet invasion of Manchuria, Soviet occupation of Eastern Europe, Iran Crisis of 1946, Greek Civil War, and so many events signaled Soviet aggression. Meanwhile, Churchill was very paranoid of Stalin and had been spying on the Soviets. Double agents were popping up everywhere, and fears boiled through Allied countries.
Federalism is one of the central principles of American Constitutionalism because helps in the dividing and sharing of power between state and national governments, thus, making organization of the government manageable and standardized.
The other major principles of American Constitutionalism are:
Popular Sovereignty; Checks and Balances; Limited Power of the Government; Separation of Branches.