Yes, it took a Brit or an American to write gut-wrenching WW1 poetry. Wilfred Owen, Siegfried Sassoon, and Alan Seeger.

These soldiers, wrote of their experiences, minus the windy phrases of the earlier times. Maybe the way the machine gun punctuated their sentences got their attention, made em shorten their verses.

Were there any great poets of the Civil War era from the Confederate side? Not just song-writers, but serious poets. Yankees had Walt Whitman who, of course, is alleged to have had a Confederate friend who perhaps contributed his knowledge of the battlefield to WW.