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:
C
Explanation:
they court ruled that African Americans whether they were slaves or ancestors who were slaves had no legal view in court.
Alan Shepard "played" golf on the moon.
Explanation:
Led by Bolshevik Party leader Vladimir Lenin, leftist revolutionaries launch a nearly bloodless coup d'État against Russia's ineffectual Provisional Government. Bolshevik Russia, later renamed the Union of Soviet Socialist Republics (USSR), was the world's first Marxist state.
