Hello!
The most accurate answer is
William Henry Harrison
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The Hudson River School was an American art movement created by landscape artists influenced by romanticism.
Massachusetts formed a board of education for the purpose of creating public school.
That's not a question...and it doesn't belong in history, it belongs in Math.
Sectionalism is loyalty to one's own region or section of the country, rather than to the country as a whole.
The NAACP won a number of important cases in the 1950's.