The battles of Lexington and Concord were also known as the first military arrangements of the American Revolutionary War. They were fought on April 19th 1775 in Massachusetts within the towns of (not subjected too but including) Lexington, Concord, Lincoln, and Cambridge.
Very early societies did not have a written language or even ways to efficienly preserve information, so we can reject the options "maps" and "written records".
As far as the other two options go - ice core samples and tree rings, both are correct! probably "ice core" samples are the better answer, since only fossilized tree rings would tell us about the very early societies.
Answer:
The Civil Rights movement in the United States was a decades-long struggle by African Americans and their like-minded allies to end Institutionalized racial discrimination.
Slavery for sure. I believe the second one is economic differences between the North and the South.
