Political tribalism started in the 1990s, says NBC News political reporter

NBC News political correspondent Steve Kornacki said in an interview that aired Tuesday on "Rising" that political tribalism in the U.S. was fueled during the 1990s. 

"What a lot of people don't remember when they think back at it was how politically tumultuous it was," Kornacki told Hill.TV's Krystal Ball last week, citing the partisan rivalry between former President Clinton and former Speaker Newt Gingrich (R-Ga.)  

"All of the wars and the conflicts, and the characters, and the divisions, to me in that decade they build and they build to that moment, Nov. 7, 2000, the presidential election. It's basically the closest thing this country will ever see to a perfect tie," he continued, referring to President George W. Bush's victory over Al GoreAlbert (Al) Arnold GoreFor 2020, Democrats are lookin’ for somebody to love Key Colorado House committee passes bill to decide presidential elections by popular vote, not Electoral college David Brock: Howard Schultz’s vanity project will reelect Donald Trump MORE

"The map that emerges from that election, the red-blue map, that's the first time we ever really start talking about red states and blue states, the red America and blue America, the way we do today. Those colors literally had no meaning politically, no meaning for political parties before election night 2000," he said. 

Kornacki's comments come as Republican and Democratic candidates look to appeal to their bases and sway undecided and independent voters ahead of November's midterm elections. 

The contests are widely expected to be a referendum on President TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE's first two years in office. 

Kornacki is promoting his new book, "The Red and the Blue: The 1990s and the Birth of Political Tribalism."

— Julia Manchester