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By adding in Maine as a free state and adding in Missouri as a slave state to balance power between slave states(mostly southern) and free states(mostly northern)
Kentucky, Missouri, Maryland, Delaware. They might not have welcomed the label of 'Northern'. But when the test came, they (narrowly) voted against the Confederates, and stayed loyal to the Union.
Missouri is in the Northern Hemisphere. It's part of the United States of America.
Because they were fighting against slaves and did not want to make things worse.
The Northern states were opposed to the Missouri Compromise of 1820. They felt Missouri should not be a slave state as it would give the South more power.
The Northern slave-states of Kentucky and Missouri.
13, from the original 11, then adding Maine and Missouri.
Iowa borders the entire northern edge of Missouri.
In 1820, there was growing complaints against slavery. Many in the northern states were opposed to slavery and those in southern states saw it as an economic necessity. To keep the balance of free and slave states, Missouri was added as a slave state and Maine as a free state. This measure helped delay the Civil War.
Maryland and Delaware. There were also Kentucky and Missouri, that we might classify as Northern, as they fought for the Union (the North) in the war.
Northern and southern states
After 1854, the Missouri Compromise, which was the attempt to balance the number of free states and slave states between the Northern and Southern states of the United States, was relinquished and replaced by the Kansas-Nebraska Act.