1. Manufacturing capacity
2. Naval strength

U.S. sailors from USS Hunchback on the James River
Photo Credit: Wikimedia Commons
3. Economics
4. Ground transport

The USS Atlanta spent most of the time deployed on the James River supporting Union forces.
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5. Population
6. Politics

Lincoln met with his Cabinet for the first reading of the Emancipation Proclamation draft on July 22, 1862.
Photo Credit: Wikimedia Commons