the answer is A!!!......................
The spread of slavery and greed for land.
I believe the answer is The Fireside Chats.
1.Use up land till resources dwindle: nomads
2.Little development of skills, besides ones needed for hunting and gathering.
3.Tribal structure, usually consisting of a few, usually related family units.
4.Emphasis on the "Becoming of Man" ritual instead of other ceremonies i.e. Marriage, birth, and death.
Because they had all they needed where they where at
