states passed segregationist legislation and expanded jim crow
Answer:
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The Sahara desert is vast, large, dry, and empty of resources. This means people/armies wouldn't walk through there because it's basically suicide. This acts as a "natural barrier" because nobody would cross the desert in the first place.
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Answer:True
Volcanic mountains
Explanation: volcanic mountains are mountains that arise as a result of non violent movement of molten lava which flows out of fissure to the earth's surface forming volcanic mountains over time after cooling. The point from where the dusts,volcanic materials (lava) are released from is known as the VENT. Volcanic mountains are different from other kinds of mountains due to their non violent movement that led to their formation.