Is the US a nation of immigrants?

Yes

Explanation:  John F Kennedy is know to call the US a nation of immigrants.

he sent troops to protect the students as they entered the school.

richard milhous nixon (january 9, 1913 – april 22, 1994) was the 37th president of the united states, serving from 1969 to 1974, when he became the only president to resign (quit). he is also known for corruption and the watergate scandal which resulted in the public losing trust in him and his resignation.