Answer:
It's A because it's the building of your military with in attention to Dominate
The reason there was slavery in the United States is because there was more work to do than people to do it. The North's population grew quicker than the South's, so they could become "moral"quicker
The Truman Doctrine was the event that triggered off the Cold War.
Explanation: Both parties were mutually hostile and did not believe in a possible peaceful coexistence anymore. The Americans and Soviets’ hostility to each other as well as the belief that they could no longer cooperate after the start of the Cold War resulted in the Berlin Blockade. Thus, I can conclude that the Truman Doctrine marked the start of the Cold War.
The Treaty of Paris marked the end of the Spanish American War. The correct option among all the options that are given in the question is option "a" or the first option. The Treaty of Paris was signed on 3rd of September in the year 1783. I hope that this is the answer you were looking for and it has helped you.