If we called them “wetback spawn” ..that might be racial, but anchor baby is a term that can apply to both legal and illegal immigrants. It gives and immigrant an “anchor” to hang on to get a green card. I have known a number of couples..non-US citizens who deliberately had a US citizen baby while visiting or working in the US temporarily to insure that they could get a green card. One couple was British..and the wife didn’t want any children..but she agreed in order to give them the green card. So they had only one.