Answer:
President Lincoln justified the Emancipation Proclamation as a war measure intended to cripple the Confederacy. Being careful to respect the limits of his authority, Lincoln applied the Emancipation Proclamation only to the Southern states in rebellion.
Explanation:
Having a large ocean on each side of the country made early Americans consider isolationist policies in regards to their relations with other nations. The oceans have served as a natural defense against others for centuries.
It allowed for steel to be produced much more cheaply and efficiently, This made steel more available so enough is produced to build skyscrapers.
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