slavery was an important factor in the south because in the south it mainly crops and not Industrialized , so all the harvesting and planting was labor Intensive with slaves the southerns wouldnt have to do it plus there were not that many willing to tend the crops which make the slaves the mostly the way of making money on plantions.
for proving that planets move in elliptical orbits
im not sure but
https://ww w.nvlchaw aii.o rg/nisei-war-europe-100th-and-442nd
that should help
