LiveScience.com - America has always been a cultural melting pot, but that pot has always been kept at a rolling bubble by the heat of xenophobia. And sometimes it boils over causing great damage. Every generation of citizens, many of them immigrants themselves or of recent immigrant ancestry, is afraid of the next wave of others looking for a better life. The fear has always been that those "other" people, the ones who are invading this country, will pollute the gene pool and degrade the culture in some manner. ...