How does USPS international shipping work?

Related questions

1. Are all USPS packages tracked?
2. Does USPS International Priority Mail have tracking?
3. Is tracking free with USPS?
4. Can I reroute a USPS package?
5. Does USPS deliver to your door in apartments?
6. Does Costco ship internationally?
7. Are USPS packages insured?
8. Can I buy from Amazon US and ship to UK?
9. How long is international shipping?
10. How much does it cost to insure a package USPS?

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