The answer is the Kansas-Nebraska Act
The changes made in the early 1800s allowed people who had no money or land (only white men) to go and vote. As a result, more white men than ever before were able to vote.
It was an immigration legislation that was signed by Theodore Roosevelt in 1907. The act restricted increasing immigration to the U.S during World War 1
It divided Europe and on the east side was influenced by the soviet union and it was to keep them from gaining more.