Well the mechanism is American military occupation and attempt at submission. Their rules / laws don’t really matter much to us. But per their laws their Congress needs to accept our admission as a state with a simple majority vote, and then the president needs to sign off on it. The only way us applying happens is if they are able to install a puppet federal government here, and even then if that all succeeds they need to prepare for an extended insurgency.

That’s why they’re so interested in making Canada part of the US. His mom is Canadian. If Canada becomes part of the US he becomes a natural born US citizen and becomes eligible to run for president. And this is one of many reasons we cannot allow ourselves to become part of the US.