A) they had alliances with eroupeian to send out expesetions
The answer is <span>The economy was increasingly controlled by big corporations.
Rapid industrialization in united states made big company able to produce an abundant amount of products with cheaper price.
This make the consumers are heavily dependent on their products and the majority of people's earning will always flow back to the big corporation.</span>
The Indian Removal Act was signed by Andrew Jackson and it was a law that was supposed to call for the "voluntary" removal of Indians from their land. The United States wanted to expand and use their land, and ended up forcefully removing them and resulted in the removal of most Indians from the states altogether. Hope this helps! :)
A very good one you should watch it sometime