Why did living conditions for southerners—black and white—change after 1820?

Cotton production expanded. The cotton gin was invented to pick out the seed from the cotton fibers. Led to increase demand of slaves, The south became dependent of plantations and slavery. It got better for them but worse for the slaves.

step-by-step explanation:

100%     = 120

1%= 120/100=   1.2

9%   = 1.2 x 9=     10.8

10.80 to the 120 to get $130.80

a variant spelling of the word dote (british)