Immigration made many people uncomfortable, when they saw lotsof people different than themselves being successful. Thus, lawsdefining race kept changing to keep the racial hierarchy inplace.However, the fact that we have so many different kinds of peoplearound also helped other people to be more open to different races,and especially cross-racial relationships and the fact that thereare so many people now with mixed heritages helps people to look atrace as a more fluid thing that many people can participate inrather than an either/or thing that has to be us vs. them.