By 1820, most american indians east of the mississippi river
a-were living side by side with settlers in peace.
b-had moved east to the atlantic coast.
c-had been defeated by the us military.
d-had won most battles against the us military.

The correct answer is option A-"were living side by side with settlers in peace".

Explanation:

There were "Five Civilized Tribes" living east of the Mississippi River: the Chickasaw, Choctaw, Creek, Seminole, and Cherokee. By 1820, most of these American Indians were living side by side with settlers in peace. This changed when Andrew Jackson took the presidency in 1829 and implemented an Indian Removal policy. By 1830, US military started the Indian Removal in the east of the Mississippi River.

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