The group that joined exclusively with the confederacy during the Civil War is the Mexican Americans,
<h3>What is Confederacy?</h3>
Confederacy also known as the Confederate States of America, was an unrecognized breakaway republic in North America that existed from February 8, 1861, to May 9, 1865.
During the civil war, the Mexican American group exclusively joined the Confederate States of America. They were unrecognized during the war that lasted from the year 1861 to 1865.
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