They saw plessy v Ferguson as that the were "separate but equal" meaning that all races were given the same opportunities but were segregated.
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The answer is
B. Spain and the U.S. signed the Adams-Onis Treaty
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They did not want slavery to spread.
Answer:
The prime meridian, or 0 degrees longitude, and the International Date Line, 180 degrees longitude, divide the Earth into Eastern and Western hemispheres. Many geographers consider the 20 degree west line of longitude and the 160 degree east line of longitude as the Eastern and Western hemispheres.