Recent wargames predict the US will exhaust regional supplies of antiship missiles within days to weeks and those missiles have a lead time of years to build and the US only has a capacity of a few dozen a year.
We don't need to sink their warships, just their freighters leaving Brazil - which they cannot quickly replace.
An immediate lack of calories will sort out any military problem out remotely.
Sprinkle in ten thousand naval mines and things look very different.
It is also important to note that China is not an Island like Britain or Australia and can secure food from other locations over land.
This kind of thinking that military conflict with China would be trivial due to some simple ace in the hole like having many aircraft carriers or cutting off their food supply needs to stop. It is hopelessly naive and underplays the very real possibility of humiliating defeat in an impending conflict with China over Taiwan.
[0]https://www.economist.com/finance-and-economics/2024/07/23/w...
[1] https://www.reuters.com/markets/commodities/china-plans-acce...
The Army and Marines are planning around having units on Islands that have to have their own anti-aircraft and anti-ship capability since they won't be able to rely on air or sea support.