Containment was the plan to stop the spread of communism. The U.S was convinced that if one country fell to communism then the surrounding ones would eventually fall to communism. We did our best to control Communism in the east. According to the U.S Countries were either purely democratic or purely communist. there was no in between.
To support revising the Articles of Confederation was that the central government lacks power or lack of centralized government power.
The previous Article of Confederation allowed the states to hold most of the power, and the central government was too weak to even function properly. Due to this there was also huge difference in terms of economics from state to state.