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.
The fall of the roman empire decentralized europe, their strong government was replaced with loose knit kings and princes. The armys were weaker, trade and education collapsed aswell plunging europe into the dark ages.
The Mississippian culture adopted the Mexican's the central ceremonial plaza building style.
The Mexico' central ceremonial plaza building style included the pyramidal and oval earth mounds design. The Mississippian culture spreads in the area that called Mississippi now. This culture is the last prehistoric development of culture in North America. This era began in the AD 700.
Answer: North Korean invasion of South Korea
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many were still racially attacked and there was segregation and hate towards them especially in the former CSA
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