you do have a right to contract out. its called migration.. leave america, and contract with a different citizenship. and boom you are no longer under the US rules.
however if you are remaining in america you are still under the laws of america. you cant contract out and yet remain... even the native american indians can be arrested for american crimes, even on reservations
yep US federal law and the constitution still applies on reservations. however reservations are seen as their own 'state' outside of american US states. so local governance at state level is different on reservations.. and no badecker you cant just declare your own state on US land and pretend to escape us laws. you have to get official independent state recognition from the US federal government if you want to create your own "sovereign citizen" dream world but remain on US land
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when it comes to the middle east. palestinians cant just create their own state and just make it be palestine. it requires recognition and acceptance.. which is part of where and why this war is being waged.

the land "from the river to the sea" is recognised as isreal, due to provenance claims and historic data of claims that go as far back as the isrealites(thousands of years)
the world governments recognise isreal. there is attempts coming in september to possibly allow the recognition of gaza as palestine, but it comes with terms.. the main one is the de-militarisation and removal of power of hamas. to have elections that put a peaceful palestinian party that equally recognises isreal as "from the river to the see"
later considerations of a co-existance of arab-isreali in the west bank