Which piece of evidence explains the cause of the creation of African-American regiments? Many opposed the Act of 1866, while others considered it a mere experiment. For the first time in U.S. history, African B American men could serve in the peacetime army African-Americans exemplary service during C the U.S. Civil War had paved the way for the new units. At the time, the United States population was D elimbing, causing settlers to expand into

## Step 1<br />The problem is asking us to identify the cause of the creation of African-American regiments. We have four options to consider.<br /><br />## Step 2<br />Option A suggests that the creation of African-American regiments was due to the opposition to the Act of 1866. However, this option does not provide a direct cause for the creation of the regiments.<br /><br />## Step 3<br />Option B states that African-American men could serve in the peacetime army for the first time in U.S. history. This option indicates a change in policy, but it does not explain why this change was made.<br /><br />## Step 4<br />Option C suggests that the creation of African-American regiments was due to the exemplary service of African-Americans during the U.S. Civil War. This option provides a direct cause for the creation of the regiments, as it implies that the African-Americans' service during the Civil War was a significant factor in their creation.<br /><br />## Step 5<br />Option D suggests that the creation of African-American regiments was due to the expanding population of the United States. This option does not provide a direct cause for the creation of the regiments.