The main cause of the Indian Wars of this period was the notion of Manifest Destiny. For decades, Americans from the east were pushing west in an effort to gain control of more land and resources. Many felt that it was their God-given right to control the continent from sea to sea. This was accelerated by the expansion of the railroad during the latter half of the nineteenth century. Sometimes valuable resources such as gold and other precious metals were discovered on native land. This encouraged more settlers and led to inevitable conflict. Land was also desired for the purposes of ranching and farming.
Explanation:
This meant that the the relations between Americans, and natives would be in a enemy context.
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It was trench warfare that was used to a great extent in World War I. This led to a significant elongation of the conflict, since targeting soldiers was much harder.
