The entire world screwed up. Each product may source many many parts from around the world.
For example, Boeing sources parts from tens of thousands partners around the world. I am curious how Boeing is able to make a single jet in this screwed up world.
There are a number of causes for the supply chain problems we are living. A huge piece of the silicon problem is that product manufacturers (cars, electronics products, toys, etc.) thought their customer orders were going to dry up, so they shut down their materials orders. That caused the factories to have to reduce production. That meant a reduction in raw materials orders from their suppliers, and the spiral continued. Then when the manufacturers realized the economy was not crashing and orders were staying strong, they asked to bring those matierals orders back. But the factories had reduced production as well as raw materials due to reduced demand and due to COVID staffing. Now they are being whipsawed. They can't turn back on immediately due to lack of raw material and COVID staffing only added to that. Shorter lead time parts come back online a little quicker, silicon (chips) are already a many month process, they can't just pound them out faster. Plus, now every product manufacturer wants their backorders faster leading to a massive backlog. The silicon suppliers (TSMC being the largest in the world) are so backlogged they are having to prioritize what they make. It's a nasty whipsaw that got created and it will take a long time to stabilize out. Add that to yet more downstream supply chain problems like transportation (trucking in the USA) and it compounds.
I wonder if Boeing ever shut down their component supply chain. Their product offering is a multi-year production sequence. They may not have felt they were going to lose aircraft orders as they know the industry will come back online long before those planes scheduled for production in a year or two are still going to be needed. The one scheduled for build in 2020 or 2021 were already so deeply into the components delivery sequence they were not easily stoppable, so let them keep coming. Yes, the airlines had to mothball a lot of planes in the desert in 2020, but that was also understood to be a short term problem in the long term scheme of things. So did Boeing just keep going? All this is my guess based on decades of experience dealing with complex supply chains for consumer products and silicon. Maybe right, maybe not. Hard to know without being inside Boeing.