Public schools in america during the late 1800s wanted immigrants to adopt american values, this is called:
a. ethnocentrism
c. cooperation
b. xenophobia
d. assimilation

The correct answer is D. Assimilation.

Explanation:

In cultural studies, Assimilation or cultural assimilation is the process by which an ethno-cultural group - in this case migrants during late 1800s - is integrated into a dominant comunity and adopts the dominant culture. Assimilation includes the adoption of language, culture, values, beliefs and behaviours.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain