In Chile can I use an iphone 11 purchased in the USA?

Is the iPhone you bought in the USA carrier-locked?

If yes, you'll need to check which carrier your iPhone is locked to. You'll need to send a request to the carrier to unlock the iPhone. This can be a time-consuming process.

If you want to save yourself some hassle, I suggest buying an iPhone that isn't carrier-locked, or buy an iPhone that supports your carrier.

More info here: https://support.apple.com/en-us/HT208856

Yes, it should. Just make sure it is on this list: https://support.apple.com/en-us/HT204041.

The carriers supported for Chile are Claro, Entel, Movistar, WOM, and VTR.

Yes but you will have no warranty cover in Chile