What factors led the western powers to abolish the slave trade and then slavery in the nineteenth century?

The social contact theory states that

What is most likely impact of clearing natural landscape to construct high rise buildings

During jefferson's administration, which of the following represented his tenure? a) he believed the power of his gov depended upon his popularity b) jefferson thought that the strength of his government depended its use if force c) she refused to add territory to the u.s without approval of the states. d) jefferson though of “hands off” approach to the states and less power in the cen. gov. would benefit the nation