The States are allowed to find solution and make a decision about the issue. There are equal powers with the Federal and States therefore, the issue can be debated. Since federal powers are superior, the Constitution makes the decision. The national government shall create specific rules for each of the States.
There missiles ready and pointed at each country by the enemy state.
The movement of USSR missiles to Cuba caused an immediate reaction by the US. Negotiations worked back and forth to prevent a missile attack by either side. The US had missiles in Turkey which the USSR believed to be a threat to their safety.
Truman Doctrine
In 1947, Truman pledged that the US would aid any nation in resisting the growing threat of communism to help prevent its spread.
The Assassination of Archduke Francis Ferdinand