They were mostly from china, building the railroad was the easiest way for them to settle in America and make a living.
The answer would be that light can be reflected or refracted
The point was that it was negotiation for two parties, they would force interaction between eachother to get an advantage in the negotiation over the other.
Explanation:
Example: this was used as a policy in the US to coerce the Soviet Union into backing down militarily.
