Germans, unless you include the English, Scots, Irish and Welsh into a single group, in which case it's English-Celtic.
1. German
2. Irish
3. English
It's also possible that there are more people of English and Celtic ancestry than the census indicates, due to lack of self-identification (6% of the United States see themselves as "just AMERIKKKAN!!!!!").
White Europeans in general have the most sway over America's food culture.
eggs
Beef Gerky
mcdonalds
blacks
The most popular sport in America would have to be baseball.
Golden Retrievers are he third most Popular in America.
The most popular food in Illinois is Pizza
Garcia. It is the 8th most popular last name in America, making it the 1st most popular HISPANIC last name in America.
Karen Carpenter is the most popular Dangdut Songstress in America.
My guess is that ketchup and salsa are closely #1 and #2
Do you mean Asian food? Or which nationality is the most populist? On both counts it would be Chinese.