Comment: You conveniently omitted the 1898 Spanish-American where we stole Cuba, the Philippines,  Guam, and Puerto Rico, I notice.  Big "Democracy War" there!  Still kept a lot of it, too!

How about " The United States occupation of Nicaragua from 1912 to 1933 was part of the Banana Wars, when American troops forcefully intervened with various Latin American countries from 1898 to 1934. The formal occupation began in 1912, even though there were various other assaults by the U.S. in Nicaragua throughout this period. American military interventions in Nicaragua were designed to stop any other nation except the United States of America from building a Nicaraguan Canal."  "Democracy War"?

How about our sponsoring the "Panama" revolt against Columbia so we could get the Panama Canal.  Kept that until 1977 when Carter gave up our claims on it. "Democracy War"?

Wars to "Protect Democracy" by the United States are pretty thin on the ground, even with your arbitrary cut off date of 1900.