Can I visit other states?

Only if you are an indigenous person from Chukotka in Russia. There’s zero customs check between Alaska and the lower 48

We're visiting American Samoa in October ... American Samoans are American nationals but not citizens ... or something ... and don't vote, or have automatic entry into the 50 states. But our US National Park pass will work there.

American Samoa is a different animal. They have a different system and has a check between Hawaii and Pago Pago. Americans need a passport to enter

There’s zero customs check between Alaska and the lower 48

There was precious little (ie zero) between Alaska and Canada as well - at least in our brief experience (Skagway to BC and the Yukon).

There’s definitely a stop between Alaska and Canada.

We saw the station at the top of the pass for sure, but it was all closed up. Coincidentally, this was four years ago today Australian time (Friday 29 August 2014).

You drove through the Fraser crossing without a check?

We drove from Skagway to Whitehorse (and return) on the Klondike Hwy with no checks at all - quite a few cars did.

@ junglejurd
American Samoa National Park has a crew of firefighters that get sent to mainland US fires. They are known for their singing. See my post here

Very nice ... and (somewhat to my disappointment) I discover that American Samoa National Park has free entry, so I don't need my America the Beautiful pass ... and I can't find any assets on Kauai or Oahu where I could use it either.