Population growth in an Nativist America?

In a scenario where immigration to the United States is made a minimal factor because of nativist victories in the early 19th century. How would the majority anglo US population grow and what would the current population be?

Btw, In this scenario the United States does not expand past the Mississippi River if that changes anything.
 
I think you would ultimately see about 25 to 50% less US population, depending on when. The earlier the fewer people. We might not buy Alaska or get outside of the 48. I do not think we would not take the Southwest though. Most of the nativists movements came after that.
 
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