There were many economy reasons for expanding. When you have more land you profit more. There would also more opportunity with more land.
If you are talking about racism, people would be protesting for years. If you’re talking about the hippies, they promoted peace and love, and no war.
The fifteenth amendment gave equal rights to everyone as long as they were a US citizen. This was mainly done to combat racial discrimination, but it also affected gender religion and much more.
Answer is A children work long hours in unsafe conditions