Carl Sandburg's "American Songbag" has a song called "Philipino Hombre" from the Spanish American War.
My grandfather drilled with the Boys Brigade, in case the hordes of Spain invaded Cincinnatti. They sang "El Capitan". It's a vaudeville song, but it's of the period.
My maternal grandmother and her sister had a dog named for one of the generals of the Spanish American war. It made a point of biting all their gentleman callers. That has nothing to do with folk songs, but I thought you'd be amused.