The united states adopted the gold standard in the 1870s for its currency because

The correct answer is  it hoped to encourage European investment in the United States

The United States had a huge amount of gold and wanted to base their currency on that amount of gold because it would attract investments from countries such as Europe which didn't have the gold standard. This proved to be successful as many countries of the world started imitating them and switching to that system.

This act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.