Why is everything "Really" made in China?
Answering this requires understanding the economics of the petrodollar, trade deficits, deficit, and the chinese current account surplus and exchange rates.
I will try to keep it short and will over simplify many things.
Chinese deliberately devalue their currency to make chinese exports "cheaper". They do this at a significant cost to the purchasing power of the the cheap chinese laborers. Since goods can be manufactured using this cheap chinese labor, goods are produced there. They are exported to the US and elsewhere. This trade imbalance results in a very large current account surplus for the chinese. If the chinese want to use this surplus to invest in china, they need to sell dollars and buy yuan. This, however, will force the yuan to appreciate vs the dollar and eliminate their competitive advantage. These dollars end up being invested, mostly, in US treasury bonds but also purchasing dollar denominated assets in the US and around the world. Other nations need dollars to purchase oil–hence petrodollars. Purchasing dollar denominated assets-US debt or other foreign assets-does not cause the Yuan to appreciate.
Most of the petroleum exporting nations have very large current account surplus's and have many 100's of billions of dollars of US debt. If any nation broke rank and dumped their treasuries it would create many predictable problems for the country who did it, as well as the rest of the world. Since Oil is only priced in Dollars(If you produce oil and want american protection and military tech you have to sign up for this deal) holding dollar denominated assets is a reasonable economic strategy since the majority of the nations want oil(including china). The dumping of US treasury debt hurts china and the US. Its would be less painful for nations that export oil.
The strategic importance of oil is diminishing but will be significant for at least another 30 years. If the US is going to keep the same kind of strangle hold on the world economy we need to force the terms of the petrodollar onto whatever the next strategic input is. Many think it will be lithium and coincidentally Afghanistan has massive economically exploitable reserves.
China, Russia, and Saudi Arabia are the 3 largest holders of US debt. China has also been promoting a trade organization called SCO, Shanghai cooperative organization to develop trade agreements in Asia/Eurasia. Trading oil outside of the petrodollar within this block would significantly injure the US economy. Further, there have been moves to make this block into a security pact arrangement which would counter NATO.
Recent developments in SA with MBS aligning with US seems to have thrown a wrench into this plan. Saudi's ability to turn the spigots on cuck's the chinese ability to weaponize their treasury debt. If they can't slam the dollar price of oil, they can't destabilize the dollar beyond the federal reserves capacity to monetize it.
I missed a lot of points, but covered a few big ones.