That'd be most of the entire continent of Africa. The governments won't take US food that has been genetically altered. Therefore, it gets shipped there and put in warehouses. It then sits there because foreign aid workers can't give it to the people. It then feeds the rats. Once the rats have eaten it all more gets sent in. Of course, if the rats don't get to it they burn it. All the while the people starve.
We've been eating genetically altered corn for more than twenty years. Sure, we're a little weird. However, we also aren't starving. And even the poorest people in the US have more than the average person in Africa. At a bare minimum, US citizens have hope.
The funny part is that the governments and some of the people blame their starvation on the US because they send the wrong kind of food. We aren't going to grow food special for them. Beggars need not be choosy.