I googled the question, what is the difference between a Republic and a Representative Democracy.
I found this answer informative... " This is a problem of definitions. The archaic definition of a republic, which is what was in use at the time of the founding of the United States, is a group in which there is equality among its members - the States are equals among the group that comprises the Federal government.
The modern definition of republic, however, is pretty much identical to a "representative democracy" - "a state in which supreme power is held by the people and their elected representatives, and which has an elected or nominated president rather than a monarch."
So, depending on what definition you are using, they are either very different or practically identical."
So the usage of the term "Republic" has changed over time. When the founders talked about a republic they were referring to a government made up of 13 equal states (now 50 states). Now republic is used more in terms of the link you provided earlier, which I pointed out was practically the same definition as "representative democracy". Before getting into this debate I never worried about the issue as I didn't think the terms were mutually exclusive (and I still don't). You can be a republic made up of 50 equal states and be a representative democracy in that the ultimate power is held by the people who exercise it by electing representatives. Its the same way a country can be both a republic and a capitalistic or the same way a dictator can be both a totalitarian (if he exercises extreme centralized control of most public functions) or non-totalitarian if a country has a dictator but effective power is diffused and held by regional leaders.