Last time this happened was when Republican Herbert Hoover (the President during the Great Depression) lost to Democrat Franklin Roosevelt.
It took 20 years for the Republican Party to win back the presidency!
First election in US history where tens of millions of unrequested ballots facilitated a stolen election.
What you seem to forget is that "ballots" are not what count. VOTES are.
But yes, all kinds of firsts on this one. First POTUS election to run around alleging "FRAUD! FRAUD! AWK" while completely unable to provide any evidence whatsoever thereof, thus committing a fraud ABOUT "fraud"...
First POTUS election where the loser was such a meltdown crybaby that he sent his goons to go stage a coup d'état ................... while he watches on TV of course, from a safe distance.