I believe, "Tanks were a fast and reliable means of transporting soldiers" is NOT true.
The best known piece composed by Ravel is Boléro. At the time of the composition, (1928) Joseph Maurice Ravel was considered as France´s most imortant living composer. Ravel was one of the first composers to use recordings to take their work to a greater public.
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The Farmers Alliance was an organized agrarian economic movement among American farmers that developed and flourished ca. 1875.
The correct answer to this open question is the following.
Although there are no options attached we can say the following.
It took that much time because people were focused first on overcoming the terrible black death plague and had not much time to learn and reason. It was a time for survival.
The other reason is that people had lived so many years believing the religious explanations that characterized the Middle Ages. People had so ingrained those religious systems from the church and it was not easy for them to have the open mind and criteria to accept different or new knowledge. If we add the fact that if people questioned the religious beliefs they were killed by the inquisition, we can understand how difficult was for people to be open to new knowledge.
So it is true that until Copernicus spent years gathering data on the idea that the solar system operated in a spherical manner, and we lived in a heliocentric world, even though the Eastern Hemisphere knew that for 2000 years: So it took the Black Plague and the Renaissance to move things forward.
Answer:
The aftermath of World War I saw drastic political, cultural, economic, and social change across Eurasia, Africa, and even in areas outside those that were directly involved. Four empires collapsed due to the war, old countries were abolished, new ones were formed, boundaries were redrawn, international organizations were established, and many new and old ideologies took a firm hold in people's minds. World War I also had the effect of bringing political transformation to most of the principal parties involved in the conflict, transforming them into electoral democracies by bringing near-universal suffrage for the first time in history, as in Germany (1919 German federal election), Great Britain (1918 United Kingdom general election), and Turkey (1923 Turkish general election).[citation needed]