I assumed the same thing about staple prizes being global, but I got to a different conclusion.
https://ourworldindata.org/grapher/share-of-consumer-expenditure-spent-on-food
The share of consumer expenditure spent on food is 6% in the US and 59% in Nigeria. It’s Nigerians, who are going to starve.
I saw this same stat a few years back and it was 9% and 88%.
How many will find their way to the Mexican/US border?
Frankly, many residents of the world would be better off just selling everything they have to buy a plane ticket to Mexico.