If you would have lived in Greece in about 300BC, you could have witnessed The battle of Thermopyle
There were several causes that lead to the Cold War. The most important ideological conflict was that the Soviets believed in Communism and rest of the worl including United States of America disliked Communism. Soviets were against capitalism and the Americans were in favor of capitalism. The Soviets were also afraid of the nuclear bombs that United States possessed during that time and it was a grave security concern for the Soviets.
It was an agreement with the states and was the first constitution of the United States of America.
The planting of crops in the beginnings of human society resulted in economic stability.
3. The Seventeenth Amendment altered the process for electing United States Senators and changed the way vacancies would be filled. Under the original constitutional provision, state legislatures filled vacancies when a Senator left office before the end of their term.
I have no clue about the others sorry to disappoint