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America agree to pay all its prewar debts to England because the English threatened to continue the war if the debt was not paid.
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.
<span> The ancient Egyptians were much more advanced than other civilizations in their era. One of their amazing achievements was inventing the calendar. They invented the calendar so they could know at what time of the year the Nile River would flood. Here is a picture of their calendar compared to ours. </span>
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To gain backing of Americans, both the Allies and Central
Powers used Propaganda intended to influence opinion. Governments
during the First World War keen massive capitals and huge quantities of effort
to creating material intended to shape opinion and action worldwide. The labors
of states to defend their actions, and to build global support, caused in some
of the most influential propaganda ever shaped.