Answer: if i am not mistaken the answer is pearl harbor.
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disclaimer: my knowledge comes form Hamilton the all american musical. it is historically correct for the most part.
Answer:
its declined because people have now become scared and have no need to fight that or people are just more focused on other stuff
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Answer:
The best answer would be A. The United States invested in science education and created NASA.
There were actually four HUGE causes for WW1, treaties and alliances brought many countries into war, the imperialism of some countries scared other countries, and they were "defending" themselves, there was a lot of weapons stocking, and countries were creating gigantic armies, and that threatened other countries, and then we have plain old nationalism.
In 1519 the aztecs invaded mexico. Hope it helps!!