America is a nation of immigrants. As illustrated fairly well by this Washington Post article (
LINK), the end result of the recent wave of immigration is uncertain. I would hope that eventually we will be able to "absorb" the new immigrants as Americans within a generation or two, but there are concerns that "the nation will continue to fracture into many separate, disconnected communities with no shared sense of commonality or purpose."
If politicians continue to cater to racial and ethnic groups specifically for their votes, instead of the American in general, it will only hurt the attempt of the US to be a melting pot.