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You seem to have missed the QUESTION.
It was:
FDR lowered the voting age in WWII to 18 --- because of the concept "old enough to die for your country... old enough to vote.
The voting age was lowered from 21 to 18 in 1971.
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SO >>>>>>>>> WHEN did the voting age go up from 18 to 21 between WWII and 1971?
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You miss the point. It was NEVER nationally lowered to 18 during WWII. . . so that question is meaningless.
No, I did not not miss the question. You seem to have problems understanding the answer. You have imagined historical facts which never occurred - that FDR lowered the voting age from 21 to 18 years of age "sometime" during WWII. Additionally, that the voting age must have then been raised from 18 to 21 at some mysterious time after WWII but before 1971.
The Congress passed legislation, on November 11,1942 which FDR signed that lowered the draft age from 21 to 18 years of age. No legislation was ever passed during WWII to lower the voting age. The Federal Congress did not have the power to force the States to lower the voting age by legislation, hence the need to propose a Constitutional Amendment to lower the State and Federal voting age from 21 to 18 years of age. States may lower the voting age below 18 for non-Federal offices if they so desire.
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