I thought this was a fascinating graphic by the NYT which tracks each state as to where the residents come from. For California the largest amount, 56%, are native Californians but the second category is foreign born, 28% which surprised me. I figured it would be high but almost three in ten? They have all the other states as well.
http://www.nytimes.com/interactive/2014/08/13/upshot/where-people-in-each-state-were-born.html?hp&action=click&pgtype=Homepage&version=HpSumSmallMediaHigh&module=second-column-region®ion=top-news&WT.nav=top-news
http://www.nytimes.com/interactive/2014/08/13/upshot/where-people-in-each-state-were-born.html?hp&action=click&pgtype=Homepage&version=HpSumSmallMediaHigh&module=second-column-region®ion=top-news&WT.nav=top-news