To cut off budget support for that policy
"C. was overthrown by invading Mongol tribes in A.D. 1279" would be the best phrase describing China's Song Dynasty, but this was of course not always the case.
They followed the seasonal grazing and migration of buffalo because they survived on hunting. This was because the ground was not fertile enough for long-term crops and like today, there were tornadoes.
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which period? I'm not able to answer this without it.
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they raised goats and sheep because they could climb the mountains. they Also planted crops and took over other lands so they could develop the land