Both President Biden and former President Trump secured enough delegates Tuesday night to clinch their primaries and the first presidential rematch since 1956.

Why it matters: A slate of primaries in states where Biden and Trump faced no serious opposition officially pushed America into a brutal and unprecedented general election.

Charted above: The earliest both major parties finished up their nominations was in 2000: George W. Bush and Al Gore both clinched on March 9 — 243 days before Election Day, Pew found.

The big picture: The last time a major political party gave a previously unsuccessful presidential nominee a second shot was in 1968, Pew Research Center said last year.

• That year, Richard Nixon secured the GOP nomination despite losing to John F. Kennedy in 1960.
• "Should a Biden-Trump sequel come about, it would be the seventh presidential rematch in U.S. history, and the first since the 1950s," Pew said.
• The last rematch, in 1956, saw Dwight D. Eisenhower face off against Adlai Stevenson.

What's next: As of Wednesday, Election Day is 237 days away. Enjoy the next 34 weeks!

Go deeper: Racial reset shakes American politics