What did Genghis Khan’s sons do after they took over his empire? They led their own wars to expand the size of the empire.
They prevented one another from crossing into each other’s territory.
They sent their soldiers to the capital to support the Great Khan.
They governed the divided empire so badly that the people revolted.

slavery, abortion, donald trump, gay marriage, racial rights, immigration  

explanation:

anything that has been broth up to the supreme court is something of grate political divide   so just look as court cases

answer:   c. the drafting of common sense

explanation:

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.