How did the invention of the cotton gin cause and increase in tensions between the north and south?

Which constitutional amendment resulted in part from unconventional forms of participation in the 1970s?

How were slavery and indentured labor in american colonies similar

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