The author of Uncle Tom's Cabin is Harriet Beecher Stowe.
Answer:
promoting an ethnically homogeneous society through restrictions on immigration
Explanation:
A nativist is a person or organization that promotes the interests and rights of the Native People of a place, over the interests and rights of people from other places.
Thus, nativists organizations of the nineteenth century promoted an ethnically homogenous society that consisted in Native People only. For this reason, they mainly opposed immigration, due to several concerns: from labor market, to social and cultural concerns, to even racism.
