D. He united the Mongol tribes and became known as the "ruler of all men". Scary dude, to be honest!
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The conflict between Henry IV and Gregory VII Concerned the question of who got to appoint local church officials. Henry believe that, asking, he has the right to a point the bishop of the German church. This was known as lag investiture.
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Embalming was important to the ancient Egyptians because it was the way they preserved the bodies of the dead by mummifying them.
The headright system was created to encourage immigration to the colonies so, the more a person brought with them (family and such), the more land they would get in the abundant land the colonies had.
