The right answer for the question that is being asked and shown above is that: "The Medieval period spans the longest time in human history." <span> Subsequent eras of history follow one another precisely with little overlap of trends is that </span><span>The Medieval period spans the longest time in human history.</span>
Generally speaking, in a "unitary system" the <span>government is completely controlled by the national government, since this means that there is only a single control group, as opposed to a republic, where power is often shared between entities. </span>
