The 22nd Amendment.
Constitutional Amendments do not require the President's approval, but rather that of three fourths of the States.
The statement that explains why the 14th and 15th Amendments to the US Constitution are considered milestones is that they granted rights to free slaves.
Article V proscribes the amendment process.
These are all related to the election of presidents.
It cannot change during a president's term.
The first ten amendments are collectively known as the Bill of Rights.
13
I believe it's around 9 presidents.
US presidents have a 4-year term.
Amendments
Four years.
A term