President Grover Cleveland, right, looks down during William McKinley's presidential inauguration in 1897. Two years earlier, Cleveland's political party suffered the biggest defeat in U.S. history during the 1894 midterms.

(CHARLOTTESVILLE, VA) The conventional wisdom is that the Democratic Party has the advantage in the 2026 midterm elections and could become the majority party in one, or both, chambers of Congress. The margin of that anticipated victory is harder to predict.

And the size of a party’s majority makes a difference. To see why, it’s worth looking back to the second half of the 19th century, when two dramatic midterm election results marked the beginning of important eras in the nation’s history.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.