Then why is the same concept unconstitutional at the state level? It seems that if it was such a grand concept, it would also be applicable for states.
Here's your middle school civics from the day you evidently ditched.
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Constitutional FAQ Answer #76 - The U.S. Constitution Online - USConstitution.net
The United States is a federal republic and a constitutional representative democracy.
The "federal" part is one of three basic types of organization of power unitary, confederal, and federal. Most nations are unitary in nature (local government with a powerful national government). There are no confederacies that I know of at this time (the U.S., under the Articles of Confederation was one; Germany and Switzerland have also had confederate systems in the past). Federal systems are common among large nations where several levels of government are needed. Australia, Canada, and Brazil are federal as well. Federations do not always work, such as in the case of the United Arab Republic.
The "republic" implies that we have a strong head of state (the President) and elected officials representing the people.
The "constitutional" part means that we have a constitution, which is pretty obvious, considering this site. Finally, the "representative democracy" part means that the people elect representatives to take care of legislative matters. Originally, the only part of the government that fit this description was the House of Representatives. Today, the Senate does, too, and in current practice, so does the Electoral College.
The mere fact that a nation has a constitution, is a federation, or is a republic, does not imply that minorities are fairly treated. It is the content of that constitution, and the values of that federation and/or republic that protects the rights of minorities. Note that a democracy, in the true sense of the word, does not protect the minority majority rules.
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But you want a true democracy.
however
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http://www.foundingfatherquotes.com/articles/22
...."The authors of these founding documents disagreed on many points, but on one point they ALL agreed wholeheartedly: "The United States is not a democracy, never was, and never was intended to be. It is a Republic."4 ��The following statements represent a small sampling of what the Founding Fathers thought about democracies."......
..."Alexander Hamilton asserted that "We are now forming a Republican form of government. Real liberty is not found in the extremes of democracy, but in moderate governments. If we incline too much to democracy we shall soon shoot into a monarchy, or some other form of a dictatorship."4 �Hamilton, in the last letter he ever wrote, warned that "our real disease�is DEMOCRACY."3
Thomas Jefferson declared: "A democracy is nothing more than mob rule, where fifty-one percent of the people may take away the rights of the other forty-nine."
Benjamin Franklin had similar concerns of a democracy when he warned that Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote! After the Constitutional Convention was concluded, in 1787, a bystander inquired of Franklin: "Well, Doctor, what have we got�a Republic or a Monarchy?" Franklin replied, "A Republic, if you can keep it."
John Adams, our second president, wrote: Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself.
James Madison, the father of the Constitution wrote in Federalist Paper No. 10 that pure democracies have ever been spectacles of turbulence and contention; have ever been incompatible with personal security or the rights of property; and have in general been as short in their lives as they have been violent in their deaths.3"......
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The Republic of the United States of America is not, and never was intended by the authors The Constitution, to be a pure democracy.
Give it up Luther, and acknowledge your lack of understanding of the principles and their foundations upon which this nation was founded.
Republic NOT democracy.