Without the Universal Postal Union, how will fees be calculated when shipping from the US or to the US? Does every country have to sign a new agreement that could include yearly collection or payment of taxes?
The same should apply for sending letters from the US to anywhere else in the world.
The Wikipedia page on the Universal Postal Union states:
"Prior to the establishment of the UPU, each country had to prepare a separate postal treaty with other nations if it wished to carry international mail to or from them."
I don’t think it is very fair the Chinese can ship very cheaply to the rest of the world but this seems like a heavy handed approach.
[1] https://www.aliexpress.com/item/SHUANGR-fashion-1-pair-5-sty...
http://about.usps.com/news/national-releases/2010/pr10_058.h...