B, Martin Luther King won it at 35 in 1964.
Interchangeable parts made the product process simpler and faster.
With the approval of the Minnesota legislature on Feb. 27, 1951, it became the 22nd Amendment to the U.S. Constitution. Harry S Truman was president at the time the amendment was proposed and passed. As a result, he was the last president eligible to be elected to the presidency for more than two four-year terms.
President Lyndon B. Jonhson
Mexico wouldn't negotiate.
Manifest Destiny.
Pacific Port.
There is many more but these are the ones I remember