Which of the following increased tensions between settlers and the Plains Indians and led to conflicts between the groups? А
the Erie Canal
B
the Oregon Trail
С
the Treaty of Fort Laramie
D
the Spanish-American War

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i think the answer is the one about environmental and social health.

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c) troops march forward in close formation against newer, more accurate weapons

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."