Through votes in the individual state legislatures. According to Article VII of the Constitution, it would go into effect when nine of the 13 state legislatures approved the document.
People from each state elected delegates to the conventions
Delegates choose whether to approve the Constitution for their state
At least 9 of 13 states had to approve for Constitution to be law of land
Explanation:
During the ratification of the constitution the founding fathers had to persuade 9 out of the 13 states to approve the new form of government. The states objections were mostly that they wanted a written document stating their rights. Rhode Island was one of the most antifederalists states.
Anticipating Montesquieu, whom Locke influenced, describes the separation of legislative and executive power. The authority of the State is based on the principles of popular sovereignty and legality. Power is not absolute but must respect human rights.