Illegal Since 1492

i just saw a photo of an illegal alien holding a sign that said, "All Europeans in North America are illegal since 1492." So anyone who isn't a pure mestizo needs to leave, apparently. And what about Africans since 1492? Everybody forgets that blacks lose their jobs to the flood of Mexicans. Communist guerillas kill Christians in Chiapas. If Europeans are so awful, why is it that no one sneaks from the EEUU into Mexico?