Answer:
World War I
Explanation:
Image result for what caused the start of world war 1
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary.
If I knew the time period I could better answer your question but from what you have provided I would say that the correct answer is A or C. I hope this helps. :)
To keep the United States free from foreign entanglements. Basically to keep out of foreign issues that did not involve them.
The Boston Massacre was the incident
