Answer:
When world war finally broke out in both Europe and Asia, the United States tried to avoid being drawn into the conflict. But so powerful and influential a nation as the United States could scarcely avoid involvement for long.
Major wars in American history include WWI and WW2 that were fought in Europe and the Pacific, it fought wars in Korea, Vietnam, Afghanistan, Iraq, and of course the Civil war that was fought in the US itself. Although there were military involvements in numerous other places, these are the most famous ones.
4. Cotton Gin harvested cotton
5. Because the cotton gin could harvest so much more, cotton farmers would buy and work more slaves for more profit.
6. A few major ones were immigration, making railroads, and using tariffs to ward foreign countries away from competing with the American market.
7. Industrial Revolution, I think the answer they want you to give is being blocked off from trading with England and France.
Answer:
relative peace and intellectual achievements