Maryland, Delaware, Kentucky, Missouri, Kansas, California, Iowa, Wisconsin, Minnesota, Michigan, Illinois, Indiana, Ohio, Pennsylvania, New York, New Jersey, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, Maine, and West Virginia (broke away from Virginia in 1863), Oregon and Nevada.
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There were 34 States in the Union when the Civil War began.
During the civil war there were 24 states in the union including the border states. but there was 23 states that remained loyal to the union during the war.
The union, which is the north. the south were gray.
Abraham Lincoln was the President of the United States, or Union, during the US Civil War.
The Civil War created a more perfect Union in that it united the Confederate and Union states permanently, giving birth to "the United States of America"!