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It took him 12 years because everyone laughed at the idea and dismissed him as a quack.
Oh, he also took some time to go fight at the battle of New Orleans against the Brits.
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That would be before the Trail of Tears. Created by a hateful man who face should never be in the $20 bill.
Back then, the Cherokee were civilized farmers and businessmen. Interesting that his invention survived the Trail of Tears. One of the most disipictable events in American history. Apparently not taught in history books because we are the good guys - just like in Vietnam and "Mission Accomplished".
People must learn from their mistakes. Not be guilty. Learn.