I think this is especially true on immigration. 90s Republicans were in favor of it. Maybe not officially in favor of illegal immigration, but they weren't trying to build up the border either . I just read a transcript of a Peter Brimelow /Tucker Carlson interview that mentions it. 90s Dems' politics still had to answer to unions, rather than the other way around. Oh and black people, arguably the biggest losers due to immigration. For Dems, whether someone had a long term plan to import a new electorate, I don't know But there weren't enough recent immigrants to make it worth making a public case of it.