Cruz was a U.S. citizen at birth.  Granholm did not become a U.S. citizen until she was 21 years old, via naturalization. "Born in Vancouver, British Columbia, Granholm's family moved to the U.S. when she was four years old. She grew up in California and became a naturalized U.S. citizen at the age of 21." (Jennifer McFadyen. About.com, Immigrant Spotlight: Gov. Jennifer Granholm January 14, 2009.)  There is absolutely no comparison.