Rhythm on the Reservation (1939)
This is one of the last of the original Betty Boop cartoons. It's pretty obvious this is the case when you watch, as Betty had undergone a recent makeover--to 'de-bustify' her and make her taller and more modern. As far as the content goes, however, it's pretty typical of many Boop cartoons.
Related movie you might like to see :

Greek Mirthology (1954)

Fright to the Finish (1954)

Ancient Fistory (1953)

Floor Flusher (1954)

Shuteye Popeye (1952)

Alice in Wonderland (1951)

Quack-a-Doodle Do (1950)

Marriage Wows (1949)

Jack and the Beanstalk (1952)

Mr. Imperium (1951)

The Inspector General (1949)

The Lost Dream (1949)

Under California Stars (1948)

The Road to Hollywood (1947)

Reet, Petite, and Gone (1947)

Hi-De-Ho (1947)

Fiesta (1947)

Calendar Girl (1947)

Till the Clouds Roll By (1946)

Rock 'n' Roll Revue (1955)