I would say Isaac Newton because his branch was basically physics. He was concerned with matter and motion. Also measuring mass of the sun and planets.
D.) Southern states rejoined the Union
The reconstruction era also allowed African Americans to gain education in the South, however, i dont think there were a lot of African Americans being able to achieve and keep equal rights. The Freed slaves also still was given prejudice, and it will be a wonder if they even go jobs in the South. The southern economy also grew slowly, as most of their lands were destroyed, and they had to rebuild.
hope this helps
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