What will America First mean for these countries where famine could become reality soon? Will other countries be enough? Will the US continue to help?
A very good question, Lweji. If the Trump/Bannon/Sessions agenda succeeds, on the whole I'd say there will be little, if any, help from the US Govt for any third world country. If there should be a disaster (natural or otherwise) in a country in which they have a business interest or one we 'need' for some reason, then perhaps. Or of course unless it's an historically white, Christian nation.
It will paint an ugly, ugly picture of a nation that has had a reputation for lending a helping hand and being the first to step up in a disaster.
There will always be US charities and other private organizations that will help out, but I'm sure they're a drop in the bucket to what would really be needed.
The problem with us is that we (the US) have been pretty self sufficient during disasters so we have grown arrogant that other nation's should be too, regardless of their economic status. I know there was some aid given by other countries after Katrina, but most of Trump's supporters have very short memories and I expect that very few of them lived in the areas hard hit by Katrina.
The short-sightedness of it is that Trump et al's environmental policies could very easily lead us into a natural disaster or even a famine due to a lack of clean water, thus a lack of clean water to irrigate crops with. Or a natural disaster due to chemical and particle air pollution leading to widespread respiratory illness, similar to the 'Big Smoke' that killed so many in London in the '50s. And if that time comes, and if we've withdrawn or refused aid to others, no one is going to come to our aid.