Answer: Franklin D. Roosevelt
Began the Mexican American war
After the fall of Empires, ridding of old countries, and the form of new ones; caused a huge change in society, economy, and social change across Europe.
Primarily the Economy through the European countries had been dramatically altered because of the new territories, and demographics of the new nations.
Germany itself faced mass economic stress due to the Treaty of Versailles.
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The correct answer is : holding a rank ( any rank really) in the military (d): the president does not need to be in military.
Actually, B is also not a requirement: one must be a natural born citizen, that is a citizen on birth- but one can be born to American parents abroad. So both b and d are correct, but i am sure that the question meant d as the answer.
Evidence, summary pretty << sure that’s it based on what i know.