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.
It could keep people from living there lives
A significant difference between the North and the South in the years leading up to the Civil War is described by A. The North favored a protectionist tariff on foreign goods, while the South did not. I hope that this is the answer that you were looking for and it has helped you.
The least successful New England colony was Plymouth, because its harbor was not as good as Boston's and this made it not a very good trade center.
