Advances in radar and mine detection technology.
Moreover, Alliances are formed for various reasons, such as the need for financial or military support, trade agreements, investments or loans. Alliances became strong in the early 19th century when European states either wanted to support the French dictator Napoleon Bonaparte or to defeat him.
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Historians look for causes and effects that help to explain how and why events happened.
It was primarily "James Madison" who tried to keep tempers under control during the Constitutional Convention, since he was very much in favor of the ratification of the Constitution.
Among the options, the best is: (3) an increase in population.
Neolithic Revolution was the agrarian Revolution, meaning that a large scale change in the way people obtained food took place: they no longer primarily hunted and gathered food (so option 4 is incorrect) but instead they focused on agriculture and keeping domesticated animals. This was more efficient and allowed for an increase in population.
