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.
Answer:The Weimar Republic faced violent uprisings from various groups, not to mention devastating economic problems. Germany between 1918 and 1919 was in chaos. People were starving, the Kaiser had fled and people hated the government for signing the armistice in November 1918 - they called them the November criminals.
Answer: B
Explanation: cause its conman sense....
