Please correct me if I'm wrong, this is my first post here.
Ok, im not really sure about this, and sorry for the very unprofessional wording of my question. So my history teacher said that the 8 year long/ 2 term president limit started after Roosevelt died. But didn't Truman finish Roosevelt's last year then proceed to be president from 1945-1953? Yes, that is 8 years, but I've heard he tried to serve another term against Eisenhower, if Truman had been elected in 1953, would he have also served for 12 years like Roosevelt?
The 12th Amendment to the Constitution is what your teacher is referring to (Italics are mine)
Section 1. No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of President more than once. But this Article shall not apply to any person holding the office of President when this Article was proposed by Congress, and shall not prevent any person who may be holding the office of President, or acting as President, during the term within which this Article becomes operative from holding the office of President or acting as President during the remainder of such term.
The amendment was proposed by Congress when Truman was serving as President, so it did not apply to him. He could have tried for a second term, in 1952 ( and could have tried for another after that, even...) but decided against it. So, the first person limited by the Amendment was Eisenhower.