You can trace the genetic makeup of most corn grown in the U.S., and in many other places around the world, to Hawaii.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hawaii-ground-zero-gmo-debate
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/huffington-post-0
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gmos
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gm-crops
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maize
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/genetic-engineering
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biosafety
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/seeds