Missouri admitted as a slave state.Maine admitted as a free state.Slavery disallowed in future territories north of 36°30' except within Missouri itself.
It is the last one they both served in the Mexican-American war
The significant advantage possessed by the Union at the beginning of the Civil War is a larger free population. They also have created big factories that can produce military supplies and ammunition. They have access to railways. This made transportation of men and supplies easier.
The War of 1812 has been called a "second revolution" for the US in the sense that it solidified the nation's hold on the territory and gained the US more respect overseas. This indeed led to "good feelings" in America, as people finally felt they could call it their country.
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