"Article I, Section 8, Clause 7: To establish Post Offices and post Roads;"
... the care of the property, the liberty, and the life of the citizen, under the solemn sanction of an oath imposed by your Federal Constitution, is in the States, and not in the Federal Government [emphases added]. Rep. John Bingham, Congressional Globe, 1866. (See about middle of 3rd column.)
"It is one of the happy incidents of the federal system that a single courageous State may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country. Justice Brandeis, Laboratories of democracy.
From the accepted doctrine that the United States is a government of delegated powers, it follows that those not expressly granted, or reasonably to be implied from such as are conferred, are reserved to the states, or to the people. To forestall any suggestion to the contrary, the Tenth Amendment was adopted. The same proposition, otherwise stated, is that powers not granted are prohibited [emphasis added]. United States v. Butler, 1936.
Also, off topic, patriots are encouraged to watch Dan Borginos excellent 37 min video (associated book). The video helps to flesh out the alleged Mueller conspiracy against Pres. Trump.
Leave parks and monuments open. When Ozero shut down the government, he purposefully shut down parks and monuments to try to make people mad at republicans for ruining their vacations, etc. The snake.
The real issue is that the Constitution does not specify the MEANS of exercising the specified powers. Then there is the fact that the CC discussed limiting the fed/gov to the specified powers and it was rejected.
There are many more tasks charged in the Constitution to the fed/gov than just delivering the mail.