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For Congress to declare independence, a majority of delegations would need authorization to vote for independence, and at least one colonial government would need to specifically instruct (or grant permission for) its delegation to propose a declaration of independence in Congress.
The American civil War was a war fought from 1861 to 1865. It was one of the bloodiest wars.
The "new industrial order" was a time in the mid and late 1800s where cities developed form small villages as people immigrated to America for the jobs and freedom it offered.