The border states during the Civil War were Delaware, Kentucky, Maryland, and Missouri. They remained part of the United States but were also slave states.
Delaware, Maryland, Kentucky, and Missouri are the four border states of the North and South. (West Virginia is also a border state)
North Dakota, South Dakota, Wyoming, and Idaho are the four states which border the US state of Montana.
During the Civil War, border states were slave states that had not succeeded from the Union. The four border states were Delaware, Kentucky, Maryland, and Missouri.
They were called border states
Missouri, Kentucky, West Virginia, Maryland, and Delaware were the five slaveholding border states.
That is called Four Corners, the only place in the US where four boundaries meet in this manner.|
Kentucky, Missouri, Maryland, Delaware.
Tennessee, Florida, Alabama
California and Arizona
Capital: Salem Four States: Washington, Nevada, Idaho, and California
There are more than two states that border Mexico, four do. California, Arizona, New Mexico, and Texas.