Answer:
It was unclear whether state laws could interfere with federal laws
Explanation:
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The innovation that had the greatest impact on westward migration was d. transcontinental railroad.
Is this a multiple choice? If so what are the different options?
Answer: B.
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The Truman Doctrine was an American foreign policy to stop Soviet imperialism during the Cold War. It was announced to Congress by President Harry S. Truman on March 12, 1947 when he pledged to contain Soviet threats to Greece and Turkey.