This is actually a trick question, because there were two leaders during the American civil war, Jefferson Davis and Abraham Lincoln.
Jefferson Davis is the <em>president of the CONFEDERATE STATES OF AMERICA.</em>
So generally,
Abraham Lincoln would be the president of USA.
It was because the <span>army was becoming less loyal to the emperor.</span>
Hello there!
An enumerated power the president has is to approve or veto Bills and Resolutions passed by Congress.
P.S. The president has other enumerated power!
Thanks!