So our independence is only legal because other countries recognized it?
You can have a passport declaring yourself a citizen of the free state of me and it is not legal unless it is recognized as legal by other states.
Yes, ... but here's the fun part, ... we're free to apply the necessary force (just like we obtained our Independence), to make said other countries recognize us, the only requirement being that we prevail.
Then we can continue to apply force, or not, as we choose.