Why was Alexius I upset with the Seljuks?

Draw conclusions  why might a cause like italian unification successfully draw people of very different backgrounds together?  

Whose writings were the source of the idea that people have a right to abolish and replace a government that violates their natural rights?

How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.