why can puerto rico split from the us but a state cant?

Puerto rico has voted before to split from the us but when 11 states tried to do 500000 americans were killed. I don't get it

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golemn9 · 26-30, M

the U.S. can allow it to split because it is not a state. States have to adopt the constitution which does not accept states to leave?

Mountainlady16 · 22-25, F

@golemn9: actually it doesn't go either way

Goralski · 51-55, M

@golemn9: yes a state can leave they just won't let it