“But as the plan of the convention aims only at a partial union or consolidation, the State governments would clearly retain all the rights of sovereignty which they before had, and which were not, by that act, EXCLUSIVELY delegated to the United States.”

Each State, as an independent extension of sovereign individuals, in the form of a representative (of individual sovereign rights) republic may at any time it chooses, select those States that it will associate with.

"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government," (Declaration of Independence)

The shortest explanation of the 10th Amendment....

" Retain All the Rights of Sovereignty " that would also hold true for the "Individual Sovereign". Now we see President Trump trying to delegate authority back to the States, Of course democrat and republican socialist on the dole within the parties have a problem with dismantling such gross overreach of centralized government.
A Representative Republic at natural law [ Is ] that Form which Good is. Plato's epistemology can be seen and understood.

Will the American sovereign citizens of the American sovereign states take their stand in the years to come? Rather than NAFTA and CAFTA, all that the North, Central, and South American states need to do is return to true sovereign status. Canadian, US, and Mexican governments are confederations of sovereign states -- something Quebec has been defending since Canada's founding. Once beholden to a central bank, sovereign states/countries lose their sovereignty -- it's called totalitarianism. I see the world citizens waking up, something has got to give. The US cannot carry the burden of Liberty for the world -- look to other nations for the Liberty movement to come to fruition.