During the 1930s the combination of the Great Depression and the memory of the tragic losses in World War One contributed to pushing American public opinion and policy toward isolationism
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 American Revolution impacted other countries as: Other republican groups fought to overthrow monarchies.
Explanation:
Read moe on the same about the impacts of the American revolution.
