Fleas can potentially transmit a host of diseases to humans, including typhus, plague, tularemia among other harmful diseases.
Article Five of the United States Constitution detailed the two-step process for amending the nation's frame of government. Amendments must be properly Proposed and Ratified before becoming operative. This process was designed to strike a balance between the excesses of constant change and inflexibility.
Regardless of how an amendment is proposed, Article V gives Congress authority to direct the mode of ratification. United States v. Sprague (1931). Of the ratified amendments, all but the Twenty-first Amendment, which was ratified by state conventions, have been ratified by state legislatures.