As the Congress is given the clear power to provide for the common defense and general welfare, the 9th and 10th amendments simply don't come into play in secession.
The Constitution also states that the laws made in pursuance are the supreme law of the land, including the Militia Act of 1792 as amended in 1795. This act gives the power to the president to suppress insurrection against a state or the United States.
Also, the phrase "states (i.e. the people)" doesn't make any sense. But making sense is not very important to neo-rebs.
Walt
It makes plenty of sense to the people, of the States, who understand what "State's Rights" mean.
James Madison suggested in Federalist 39 that each state was “a sovereign body” only “bound by its voluntary act” of ratification. Other Federalists, including James Wilson, Alexander Hamilton, and John Marshall at the Virginia ratifying convention, held that such a proposal was already present in the Constitution and that the new government would only have the powers delegated to it. Opposition to and suspicion of the proposed Constitution on the grounds that it would infringe upon the privileged status of the states was widespread.