Hawaii
“Did you know that there is only one place where cocoa is grown in the United States? That place is the Big Island of Hawaii. In fact, the Big Island of Hawaii is the only place in the world where the raw ingredients for all three major infusion beverages are grown - coffee, tea and cacao. Hawaii’s warm, tropical climate makes it an ideal location to grow these products.”
Source [EN] :http://gohawaii.about.com/cs/foodglossary/a/chocolate.htm