I believe there's more of an inverse correlation: the wealthier a population, the lower its birth rate. One-off starvation events caused by unusual weather in a

I believe there's more of an inverse correlation: the wealthier a population, the lower its birth rate. One-off starvation events caused by unusual weather in agricultural societies are one thing, where temporary aid would be helpful. But poverty in particular places isn't caused by a global shortage of food, but local factors such as incompetent and/or corrupt administration or culture and subsequent lack of economic development. There may not be much that a US organization could do about it.