Containment is a U.S. policy that tries to stop the spread of Communism by "containing" it to the areas that it has already spread to. This policy was used after WWll and just before Cold War tensions started to heat up between the U.S. and the Soviet Union because America wanted to stop Communist Russia's influence on the rest of Europe.
The first major domestic crisis of the US government under the Constitution resulted from the federal government exercising its new right to tax the states in order to bring in more revenue to pay down the war debt.
The renaissance was the "rebirth" era of Europe that followed the middle ages. It was a period in which the arts, sciences, and politics flourished. It began in the 14th century in Italy. Notable figures during this time period include Leonardo Da Vinci, the Medici Family, Michelangelo, and Machiavelli. It quickly spread all throughout Europe.