Answer:
In the Roman Republic, there were two classes - patricians and plebeians. Patricians had full authority, which plebeians didn't accepted. They fought for their rights, and gained them. That is why Roman Republic transformed in total.
Explanation:
Patricians were wealthy landowners who were bringing all major decisions. Plebeians who were mostly poor wanted some type of representative in the government. They retreated from the city, thus making patricians to accept some of their requests. Among the other things, they could vote, enter the Senate, even take the role of consuls.
Through migrations quotas and legislation such as the Chinese exclusion act
Some examples of this were the Fugitive Slave Act, Preston Brooks's attack on Charles Sumner, and the Dred Scott decision (the part of it which said that African Americans could never be citizens). None of these events tangibly hurt the North or the South.