Hey I’m a traveler in USA I want to buy an iPhone 14 pro max 256 GB with SIM card slot how can I get?

Apple doesn't sell those in the USA. Get one from your own country's store.

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You wait until you get back to your own country and buy it there.

Apple does not sell any iphone 14 model with a SIM slot in the US.

You cannot purchase an iPhone 14 Model in the US with a Physical Slim. If you need one with a sim tray, DON'T buy your phone in the US.