The union wanted safety regulation , shorter hours , and better wages
The American colonists might have agreed, but they wanted to have a say in the decision. They wanted the right to vote about their own taxes, like the people living in Britain. But no colonists were permitted to serve in the British Parliament. So they protested that they were being taxed without being represented.
I think it was because there were too many immigrants coming in and taking our jobs, and American decided figure out what was an actual American, (so like the first settlers), and the immigrants weren't
"American" I actually think they limited china on how many people could come into the US and then after so many people came they cut them off, and then the Chinese who wanted to come to America would have to wait until next year. But then they considered that un American I guess unconstitonal is the word and then undid that law. I hope this helps.
The answer is slavery. The Republicans were anti-slavery, while the democratic south was pro slavery. Eventually that, and a couple of other things, led to the Civil War.
Sorry if this was a bit late, Brainly had just recommended this question for me to answer, but I hope this helps!