Answer:It was because the freedom riders challenged the non-enforcement of the U.S Supreme Court decisions that ruled that segregated public buses were unconstitutional.
Explanation:
The Mound Builders were generally known for "<span>d. building large cities," since they would build "mounds" that were used for a variety of purposes--religious, residential, etc. </span>
Answer: 1: C
2: C
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It is due to the end of the Cold War with Russia.
