Minnesota provided a large number of units in the American Civil War proportionate to its small population of approximately 170,000 in 1861-1865, with some 26,717 state volunteers being recorded, although a number of those are individuals who reenlisted in other units.
Maine was admitted in 1820, and Missouri in 1821, but no further states were added until 1836, when Arkansas was admitted. From the constitutional standpoint, the Missouri Compromise was important as the example of congressional exclusion of slavery from US territory acquired since the Northwest Ordinance
