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:
Each city-state, or polis, had its own government. Some city states were monarchies ruled by kings or tyrants. Others were oligarchies ruled by a few powerful men on councils. The city of Athens invented the government of democracy and was ruled by the people for many years.
Explanation:
Its john dewey not maria montesorri because she was a italian educator and psychologists.so the answer is John dewey
Answer:
I think it is the invention of the globe.
Explanation:
People could see the Earth from a new perspective
1. a centralist is a latin American politicians who favored strong, centralized national governments with broad powers
& a federalist is a Latin American politicians who wanted tax and commercial policies to be set by regional government, rather than a centralized government
2. centralists are conservative politicians & federalists are liberal politicians