Why did slavery grow faster in the lower south than in virginia?

The South has a longer growing season than Virginia.

Explanation:

Therefore more farms and plantations,which required a lot of field hands(obviously this was before mechanized tractors etc.) Being a house slave was a better position than being a field hand,as the individual got better clothing & the workwas less physically demanding.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

what do you mean