The Glade 4.0

Convicted felons, the mentally ill, and people under the age of majority. Sound familiar?

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Well Ali Baba had them forty thieves, Scheherezade had a thousand tales
But master you in luck 'cause up your sleeves you got a brand of magic never fails...
...Mister Aladdin, sir, What will your pleasure be?
Let me take your order, Jot it down -You ain't never had a friend like me
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Athens.

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"...but there exists also in the human heart a depraved taste for equality, which impels the weak to attempt to lower the powerful to their own level and reduces men to prefer equality in slavery to inequality with freedom." - De Tocqueville

The majority of Athens could not vote. First of all, limiting voting to only males without any other restrictions already makes a majority impossible, as women are more common than men, and Athens had plenty of other rules.

I don't know why you think there will be some sort of oppression against the disenfranchised by the enfranchised. The enfranchised will not be one homogeneous group; they won't all go the same way. There's also still plenty of incentive to give the disenfranchised as much freedom as possible. That way they are generally more succesful economically, leading to fewer problems with crime and such. If you want them to still be willing to serve in the military, you'd need to give them a reason to do it.

You're extrapolating too much of a shift in the overall mentality and culture of the U.S. from a simple voting qualification.

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"Hysterical children shrieking about right-wing anything need to go sit in the corner and be quiet while the adults are talking."

This.

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“The duty of a patriot is to protect his country from its government.” - Thomas Paine