What is the purpose of a union?

question 1 options:

to use collective strengths to demand fair pay and improved work conditions

to get your employer fired

to overthrow the government

idk but found this on google

"the kansas-nebraska act allowed each territory to decide the issue of slavery on the basis of popular sovereignty. kansas with slavery would violate the missouri compromise, which had kept the union from falling apart for the last thirty-four years. the missouri compromise had prevented this from happening since 1820."