"The Indian Reorganization Act improved the political, economic, and social conditions of American Indians in a number of ways: privatization was terminated; some of the land taken was returned and new land could be purchased with federal funds; a policy of tribal self-government was implemented; tribes were allowed to incorporate businesses and credit established to further such business; and education & employment opportunities were greatly enhanced"
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Any options, that are not listed here.
The correct answer is D.
Many of the European countries involved in the era of imperialism had a large standing army. Countries like Great Britain and France had been around for centuries and built a strong military. The other three are all important factors that lead to the increase of imperialism in the 1800's.
It was important because it proposed a completely different view of the universe and the position of the Earth and Sun within it. Prior to Copernicus, it was thought that the Earth was stationary and that everything in our galaxy revolved around it. However, the heliocentric model proposed a different view - it means that the Sun is actually the center of the galaxy, and everything within the Milky Way, including the Earth, revolves around that star.
