D. it took a long time for them to finally say everyone was equal
Answer:
in June 1846, the Senate, preoccupied with war against Mexico, quickly approved the Oregon Treaty with Britain, setting the boundary at the 49th parallel.
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The help of African-American military personnel during World War II drove for greater civil rights after the war. A perfect example of this would be the Tuskegee Airmen. This group of African-American pilots performed thousands of successful missions during World War II. This showed that African-Americans contributed a significant amount to the war effort and were willing to risk their lives for their country. These accomplishments were used as proof that blacks deserve the same rights as whites in American society.