Answer:
a. "Safety in numbers"
Explanation: They stayed in wagon trains together to be more protected and to make sure no one got stolen by Native Americans.
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The innovation that had the greatest impact on westward migration was d. transcontinental railroad.
Because the Spanish brought over diseases which wiped out most of the Native American population.
Hello! I believe the answer is the last one. Supported democratic South Korea against communist backed North Korea. Hope this helps!
