However, changes in industry and the arrival of immigrants in key locations would soon spell the rise of the Republican Party in Delaware.

One candidate, John Addicks, was infamous for attempting to buy a U.S. Senate seat by exploiting the rising party.

[3] Although Addicks didn't win election in 1899 or 1901, his corrupt tactics led to a vacation of the U.S. Senate seat for over ten years.

Since World War II, the Republican Party of Delaware has had its time of prominence and powerlessness.

Two Republicans, John J. Williams and J. Caleb Boggs, compromised two-thirds of the "Big Three" in Delaware politics.

First elected in 1970, Roth lost his bid for a sixth term in 2000 to Tom Carper who has held the seat since.

Glen Urquhart ran as the Republican nominee for the House seat in the 2010 election and was subsequently defeated by Democratic challenger John Carney.

In 2018 elections James Spadola ran as the Republican nominee for auditor and was subsequently defeated by Democratic challenger Kathy McGuiness while Simpler was defeated in his bid for a second term as treasurer by Democratic challenger Colleen Davis.

In 2016 young millennial and civil attorney, Anthony Delcollo defeated long time 26-year incumbent, President Pro-Tempore Patrica Blevins (D) by 206 votes and thinning the partisan margin in the Senate.