One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
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Uh, what is the question?
The result of union and confederate casualties during the battle of Gettysburg caused Robert E. Lee offered his resignation to President Jefferson Davis. The Aftermath of this event caused the union to win.<span />
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The French Revolution was the first democratic revolution in Europe that actually gave birth to a stable democratic state. Foremost it is seen as the beginning of the democratization of Europe.
