Answer: “Effect of buffalo extinction to American Indians- their survival was difficult because the buffalo was a major source of food and warmth.”
For thousands of years, North American buffalos roamed free and bountiful, and the Indians were able to remain sovereign because buffalos were their lifeline.
Buffalo was a major source of food and warmth thus it was difficult for the American Indians to survive when it became extinct. Hunting led to its extinction.
They weren't so successful at conquering Europe or China. Of course, one can blame the long supply lines, but in these cases their adversaries were also determined to repulse them.
In contrast, Byzantium and Persia were exhausted from mutual warfare. Tribes related by kinship to Muslim Arabs had served as mercenaries during this period, so there was a lot of tactical knowledge available.
The Byzantines retreated to the highlands of Anatolia upon losing their lower-lying provinces to the Muslims. I am not sure if they launched a determined counter-attack. The Persians did, but they could not fight coherently.
Because it had a reputation as the most segregated city in the South
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The Board of Special Inquiry is the answer