The "I got here first" argument went away in fourth grade. Some Native Americans came after the first Native Americans. The first ones didn't hand over their hunting  territory and their culture in the name of multiculturalism.
The history of mankind has been one of more dominant cultures displacing weaker cultures. Not always a good thing, but that's the way it has worked. Survival of the fittest, unfortunately.
Earlier immigrants did not have the massive welfare state and bilingual education waiting for them when they got here. Nowadays we have a manufactured migration brought to you by the political class, for their own political reasons.
The homegrown population is being forced to fund their own displacement through the education establishment and the welfare state. Low income minorities are most affected.
If you dare question the holy tenet of multiculturalism then you are called a hater by the enlightened ones. 300+ million already here and we haven't even met all of their needs.