What were the effects of the Plessy v. Ferguson decision

The Plessy v. Ferguson decision upheld the principle of racial segregation over the next half-century. The ruling provided legal justification for segregation on trains and buses, and in public facilities such as hotels, theaters, and schools. The impact of Plessy was to relegate African Americans to second-class citizenship.

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. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.