Belt and road projects will still allow some trade through central Asia/Russia, but the lions share of trade are maritime so no, I do not believe there's much that can be done from the Chinese side if they pursue that strategy, but at the same time it's a kamikaze strategy that will bring worldwide economy tumbling down.
That kind of blockade would hurt them more than China no matter how you look at it, it is a certain Stone Age economy for the US.
For natural resources and food security, China already has its own reserves, Russia, Central Asia, and those SE Asian countries with shared land borders below.
This is the best-case scenario for China.
I just hope that China will be smart and not let selective shipments of goods, they should stop exporting ALL goods to the US in that case.
They will then autodestruct themselves, Americans have no unity like China.
Once they experience such historical hyperinflation where there is no more Chinese goods on their shelves.
US economy is 70% consumption and most of that is Chinese goods or goods with Chinese parts.
It would also hurt China, but China is 10 times more united than the US, in all kinds of ways and statistics imaginable.
The US already routinely experiences civil unrest, and if they get such 500% per month hyperinflation, there would be a civil war this time.
China will experience economic depression in GDP terms, however, China is 100 times more united racially, ethnically, ideologically, and politically, they don't have 50 States, most civilian arms on the planet, hate for one another, hate for their government, the sentiment of secession, like citizens of the US, etc.
And once the US disintegrates, in a few months, China can continue trading with the rest of the world.
Even if they beg China to continue shipments then, China shouldn't do that until they see that the US collapsed.
They would collapse in multiple blocks because some states wouldn't want that kind of garbage hyperinflation currency like the dollar and will leave to print their new currencies. The US is a dying empire already today even without that kind of historical war. It would be the biggest slap.
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