Although you unhelpfully didn't supply the following choices, the answer is
<u>the opportunity for former slaves to leave the U.S.</u>
Answer:
Since entrepreneurs were usually rich businessmen, they used their money to invest in new inventions. These new inventions created break throughs in the industrial revolution, causing the entrepreneurs to get richer, and invest in other new inventions.
Hope this helps✌️
Unfortunately, you didn't share any following reasons so that someony could choose the correct one, but I am pretty sure that I can help you and name the main factor. Definitely, the point which caused a decrease in the size of the armed forces at the end of the cold war is that the US promised to decrease its armed forces as part of the peacetime agreement. I bet it will help you!
