The evacuation was necessary because a. Manhattan's bridges were blown
b. Manhattan is an island
c. the tunnels were taken over
d. the only way out was by air

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

i think the answer is the one about environmental and social health.

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