> Well modern America has no real food culture. Most countries combine the same 5 local staples like rice, vegetables meat, local seasonings etc so they always have it on hand and know how to easily make something.
Glad you threw in "modern". We do have regional food cultures but they're too boring for most people, especially if you do it right and shift the menu with the season ("Stew and cornbread? Again?" well yes, it's Winter, want a side of hardy greens to go with it? "ew, catfish! Gross!" yes, that's... what's around. What, you want mahi mahi?).
We want more variety and to eat all kinds of produce year-round. You can just pick any "ethnic" cuisine (especially if it has a similar climate to the one you're in) and get like results, but people in the US don't do that either, mostly, probably for the same reasons: that they'd start to find it too dull, or would prefer not to eat so many of the dishes for one reason or another that they'd have to sub in others from other cuisines to make up for it.