Here is what I got:
Until the 20th century, most dancers could work professionally only on the popular stage – music halls, burlesque, and vaudeville. Vaudeville shows featured tap, and toe dancing, comic and character dance sketches, adagio teams and ballroom dancers, skirt dancing, artistic or interpretive dancing, and specialty numbers in various ethnic styles. Even though the first known “ballet” in America was arranged in 1735 by Henry Holt, an English dancing master, until the 20th century, few permanent organizations were capable of presenting full ballet productions and ballet remained a high-toned addition to spectacle or an appendage of opera.
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