What issue gave rise to the 13th, 14th, and 15th amendment?

Who founded the social contract theory of the government

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste

What is domino theory? how did domino theory impact the us involvement in the vietnam war