In the years from 1830 to 1860, the number of slaves in the united a) quadrupled b) nearly doubled c) grew 50 percent d) nearly tripled e) grew 70 percent

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.

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.