Slavery

"The Sharing of Flesh."

The Allied Planets spaceship, New Dawn, has found an isolated human colony planet where there is:

"...a large slave class." (p. 674)

However:

"...none of the space travelers was unduly shocked. They had seen worse elsewhere." (ibid.)

Furthermore, history might inform them that there had been slaves in two previous interstellar civilizations, the Merseian Roidhunate and the Terran Empire. The Domain of Ythri had phased out slavery with the help of technology from Terran Technic civilization.

The text continues:

"Historical data banks described places in olden times called Athens, India, America." (ibid.)

Thus, in this story by an American sf writer, America is remembered not as a land of the free but as a place where there had been slaves.

A local leader tries to convince a Krakener that his people are civilized. They eat only slaves.