Near the end of Harry Truman's presidency, the 22nd Ammendment to the U.S. Constitution was ratified. It stated no one would serve as President of the United States longer than two consecutive terms.
Since then, not only has there not been a president for more than two terms (including non-consecutive), there hasn't been a political party that has held the White House for more than 12 years.
Admittedly or not, the two-term limit was proposed shortly after the death of Franklin D. Roosevelt, the only president elected to four consecutive terms. When Truman was included, the Democratic party held the presidency for 20 years, from 1933-1953.
Look at what has happened since then. For the most part, party control of the White House has swung-like a pendulum-nearly every eight years, from Republican to Democratic and back again.
Republican Dwight Eisenhower was in office from 1953-61, followed by Democrats John F. Kennedy and Lyndon Johnson from 1961-69 (LBJ had mostly JFK appointees in his cabinet for most of his administration).
Then Richard Nixon, followed by Gerald Ford with Nixon's resignation, from 1969-76.
The first deviation was Democrat Jimmy Carter's election in 1976, with Carter serving one term when he was defeated by Republican Ronald Reagan in 1980. Reagan then served two terms from 1981-89, succeeded by his Vice-President, George H.W. Bush. But after Bush lost to Bill Clinton in 1992, Democrat Clinton served two terms, as did Republican George W. Bush (2001-09) and Democrat Barack Obama since 2009.
Tuesday's election of Donald Trump means the White House returns to the Republican party in 2017. While a lot of people don't like that, in one sense, it keeps intact a tradition that has existed since the 1950's.
And, perhaps, that's the only thing about Trump's victory that can be called traditional.