Answer:
The border states, which had not seceded, but separated the United States from the Confederate States, were of great importance to the Northern war strategy. In order to win the war, the Union Army would need to pass through the border states to invade the South. On the other hand, the border states, if they joined the Confederacy, would make it extremely easy for the Confederacy to attack and occupy Washington D.C.
Explanation:
Article IV of the Constitution requires that states give full faith and credit to the public acts, records, and civil judicial proceedings of every other state. So, payments can cross state lines. For example, marriage licenses, driver's licenses, and debts work in every state.
Rapid economic growth
New products and technologies improved middle calss way of life
Most Americans wanted political and social reform
Corrupt politics
Earth would be the answer
