Why did the antislavery and pro-slavery groups encourage people to move to kansas?

Why did leaders such as siddhartha gautama abandon hinduism to createbuddhism around 500 bce:

The military dictatorship inviolently reacted to the opposition of the maya, who demanded greater rights for their native population. the genocide inresulted from a struggle between arab nomadic tribes and non-arab agricultural groups. the tutsi were the victims of genocide inat the hands of the hutu rulers.

Based on this passage, which issue facing laborers did samuel gompers want to focus on first?