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.
The U.S. Constitution specifies how the government is run and how power is distributed. It also specifies what rights and privileges citizens have, which includes -- but is not limited to -- voting rights. Six amendments to the Constitution deal with voting, and they all reflect the era in which they were passed. The 12th Amendment, ratified in 1804, specifies how the president and vice president are elected.