Why didn't countries help each other during the Dust Bowl? Please provide evidence to support your answer.

The Dust Bowl was an event that only really affected the United States. It occurred in the 1930s when a drought struck the southern Great Plains, making it almost completely untenable as farmland. It was not really an international incident that would have led countries to help each other, and the United States has not typically sought foreign aid in response to its natural disasters. But because this event occurred in the midst of the Great Depression, I will discuss the reasons countries did not help each other during that broader event. For one thing, large expenditures on foreign aid would have been very unpopular during this time. Americans and Europeans were generally geared toward economic isolationism in any case, and given the wretched economic conditions in many countries, it would have been politically difficult to justify large expenditures on foreign aid. Another reason is that many people, especially politicians, thought protectionism was the best response to the economic downturn. They enacted tariffs (like the infamous Smoot-Hawley) in an attempt to boost industrial and agricultural prices in their respective countries. This backfired heavily, and some economic historians argue that it actually worsened the Depression, contributing to its global nature.
https://www.economist.com/christmas-specials/2008/12/18/the-battle-of-smoot-hawley