Use these links for additional information:
http://www.teacheroz.com/20thcent.htm#immigration
http://teacher.scholastic.com/researchtools/researchstarters/immigration/
http://www.angelfire.com/ns/immigration/
http://nationalhumanitiescenter.org/tserve/nineteen/nkeyinfo/nromcath.htm
http://borderbattles.ssrc.org/Hirschman/index2.html
http://www.andrew.cmu.edu/user/sc24/immigration.html
http://lcweb2.loc.gov/ammem/ndlpedu/features/immig/immigration_set1.html
