What is the blue wall, and what does it mean for 2024 election? [Video]

(NewsNation) — With less than a month until Election Day, Vice President Kamala Harris is making stops this week in three states that experts say are critical to winning the White House.

Harris, the Democratic presidential nominee, is visiting Michigan on Tuesday for an event with Charlamagne tha God and another one with Black entrepreneurs in Detroit following a Monday trip to Pennsylvania. Next, she’s set to travel to Wisconsin.

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Republican nominee and former President Donald Trump also stopped in Pennsylvania this week for a rally in Pittsburgh.

All three states are part of the so-called “blue wall,” a set of states that have typically voted for Democrats in presidential elections since 1992.

Which states are part of the blue wall?

California, Connecticut, Delaware, the District of Columbia, Hawaii, Illinois, Maine, Maryland, Maryland, Michigan, Minnesota, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington, and Wisconsin are included …