What are the things that affect the case for open immigration?
> How does that justify help? It's not just like you help them to get on their feet and you're done. They and their descendants will live in your society for generations. Nobody is obligated to give them this at the expense of their citizens.
What is the harm in them living in my society?
> They want to immigrate here because wages are higher. However, there are only a limited number of jobs, and so flooding the job market with more people prevents natives from being able to find work, which is against their interests.
No, there are not a limited number of jobs. See lump of labor fallacy. Some natives will have a harder time finding work, but there's a net benefit to natives.
Just read this: https://www.reddit.com/r/Economics/wiki/faq_immigration
> It's exactly like Roosevelt's Judicial Procedures Reform Bill of 1937, where he tried to pack the supreme court with justices favorable to his political faction, except this time they are trying to pack the US electorate. These people and their descendants overwhelmingly vote left.
Don't give immigrants the right to vote or full citizenship then. Problem solved.
> >Well, I am against forcing racial diversity, so you can stay with your ethnic group/society in my proposal. That's illegal in the United States. Every ethnic group has to live among every other ethnic group. Nobody can create societies that only allow people of their ethnic group to live among them, so it's not true that anyone can stay with their ethnic group, barring some serious constitutional reforms.
Source for constitutional reforms being needed? I think the U.S. constitution only says the government can't discriminate based on race, ethnicity, etc.