It took several years. Now, we don't know the exact number of years it took to find out what roman concrete was made of, but we do know it took several years. Hope I helped! :)
Answer:
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Explanation:
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American troops landing at Omaha Beach were pinned on the beach by strong German fire.
Answer:
Board of Education. The Court overturned Plessy v. Ferguson, and declared that racial segregation in public schools violated the Equal Protection clause of the 14th Amendment.
