The answer is that B - nealry doubled. People started to make steps to finish slaves in United States between 1830-1860. However they couldn't change anything until Abraham Lincoln.
Answer:
b) nearly doubled
Explanation:
The purchase of the Louisiana territories nearly double the size of the United States, which granted the Americans a lot of new lands to populate, but it also meant that it would cause the spread of slavery. Slavery was such a strong characteristic of the cotton belt during those decades that it started being called the black belt.
