What is the main purpose of America giving foreign aid? Why are some Americans opposed to giving foreign aid to other nations?

Explanation:

Foreign assistance is aid given by the United States to other countries to support global peace, security, and development efforts, and provide humanitarian relief during times of crisis. It is a strategic, economic, and moral imperative for the United States and vital to U.S. national security. Some Americans are opposed to foreign aid but they don't want it to be paid for by their tax dollars.

would not cooperate with each other voluntarily.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.