> There's only one side (leftists) and one party (Democrats) that are arguing for more immigration and open borders in the US This is only true if you refer to

> There's only one side (leftists) and one party (Democrats) that are arguing for more immigration and open borders in the US This is only true if you refer to extreme left/democrats and extreme right/republicans. Moderate democrats (the ones usually in control) routinely set limits on immigration and refugee issues. Moderate republicans, who were usually in control pre-trump, are very pro-immigration (it keeps labor market competitive). Note that union-oriented folks often times are anti-immigration. Union folks at the national level are currently largely aligned with democrats, but their members have made a massive shift towards the Trump-flavor Republican Party. To close, I don’t think that the political line is quite as clear as you seem to propose. The extreme left may want few/no immigration limits, and the extreme right may want extremely strict immigration limits, but the moderates from both sides want healthy immigration with limits, and the specifics of the limits are the main issue of contention. Said another way, the moderates from both sides are closer in ideology to each other than to the extremist sections of their respective party/ideology.