That "19th century ethnic activist" was born in the US after her family emigrated here more than a century prior fleeing the Inquisition. Her activism was aiding refugees entering New York as they fled the pogroms of Eastern Europe. My ancestors entered this country in the 19th century though that "golden door" as "poor huddled masses" fleeing those same pogroms. I admire that "ethnic activist" not locking the door behind her just because her ancestors happened to make the journey in a prior generation and therefore I echo that mindset. For me, being anti-immigration would be like spitting on all their graves.
This country was built on the backs of immigrants and slaves which instills in me the belief that even more central than freedom, there is no ideal more core to the United States as a nation than immigration.