Although this particular constitutional amendment was passed after the US Civil War, it is still in effect:
US Constitution 14th Amendment
3: No person shall be a Senator or Representative in Congress, or elector of President and Vice President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may by a vote of two-thirds of each House, remove such disability.
Hillary has taken the oath more than once (as Senator and as Secretary of State).
Hillary has given aid and comfort to terrorist groups and others who appear to be enemies of the US Constitution, including ISIS, the United Nations, and George Soros.
She therefore is disqualified from holding ANY office, including that of President.
All we have to do to stop her is to FOLLOW OUR CONSTITUTION.