I may be wrong, but I do believe this may have to do with Andrew Jackson's election, and the voting requirements changed because you no longer had to own property or be wealthy to vote. The common, free white man could vote.
Answer: reservations
Explanation: The correct answer is reservations.
In U.S there was a lot more land available at the time and many people were looking for a fresh start. Many people were looking to expand trades and business. In the city many places offered unskilled workers opportunities for a steady job.
Hope this helps!