Answer:
McPherson states that Union soldiers fought to preserve the United States, as well as to end slavery, stating that: While restoration of the Union was the main goal for which they fought, they became convinced that this goal was unattainable without striking against slavery.
Explanation:
https://en.wikipedia.org/wiki/Union_Army#:~:text=McPherson%20states%20that%20Union%20soldiers,unattainable%20without%20striking%20against%20slavery.
