The US has been an interesting experiment in basically democratic cultural development. A fundimental idea which has lasted throughout our history has been the that all individuals were basically equal - at least those we considered members of our culture. We reluctantly expanded this idea to include those we at first tended to reject: Negro slaves, late-entering groups of immigrants, even women to some extent, but now we seem to be on the verge of including all Americans as equal citizens - even those who have snuck in.

This is a very good idea because our economy is set up so as to provide more economic income and social satisfaction for individuals  in direct proportion to the well-being of ALL individuals. By this I mean,  that if the lower income citizens do well, all social levels benefit - the wellbeing of the richest americans actually depends on the lowest income americans doing well. Check 20th century american history for ample evidence of this.

Given this obvious fact, any government or economic actions that tend to support the very rich by lowering the income of the very poor or political actions that tend to restrict the idea of individual equality will eventually end with the very rich somewhat poorer than they would have been had they not supported any such action - and all americans somewhat poorer for having discriminated against any inhabitants.

That being the case, current attempts by a fast-disappearing white majority in some states to restrict the political and economic rights of minorities and those who tend to support them is actually going to have an adverse effect.  Fortunately, the practical democratic reaction to such attempts eventually corrects such undemocratic actions, but it sometime takes a very long time.

In the case of immigration laws, probably the best interests of all citizens would be to make them as lax as possible - after all the most of the ancestors of present americans immigrated under almost nonexistent restrictions and we've done all right.