Answer:
C. Battle of Antietam
Explanation:
The Battle of Antietam was the single bloodiest day of the war, with both sides suffering enormous losses. Lee's army barely withstood the Union assaults, then retreated to Virginia the next day.
Abraham Lincoln saw the Confederate States of America as illegitimate. He saw it as simply a part of the United States that had different views than the north.
C he was very outspoken about state rights