To demonstrate its scientific superiority over the Soviet Union
The whole point of the Cold War was to compete with the Soviet Union to show them that they were better than them. The way America did this was by building up their nuclear arsenal as well as funding projects like NASA that would the USSR that they are capable of magnificent scientific feats.
Article 5 describes the process of Amending the US Constitution. Specifically, it specifies that Amendments need to be ratified by three-forths of all states. This means that the central government cannot change the Constitution without the States's agreement, which is in line with the principle of Federalism.
Government positions paid a lot of money
Greece, Athens, and Sparta were involved because athens grew more powerful and tensions rose which escalated to almost 3 decades of war. Sparta got stronger and more victorious while the continuous fighting left the Athens bankrupted and demoralized.