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Unfortunately, she was not American.

That's not an issue unless she wanted to be president. She taught in the US, and that's good enough for me.

And she's dead and has a name, which is good enough for the Department of the Treasury. That's the only legal restriction I could find on who may appear on US currency and securities [1]:

United States currency has the inscription “In God We Trust” in a place the Secretary decides is appropriate. Only the portrait of a deceased individual may appear on United States currency and securities. The name of the individual shall be inscribed below the portrait.

See the FAQ [2] at the Bureau of Engraving and Printing site for some interesting information on how the current choices came about.

[1] 31 USC §5114(b)

[2] http://www.moneyfactory.gov/faqlibrary.html

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