The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
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The government will first tell the US people about what is going on and why we are going to war but also they will ask all of us young proud citizens to join the fight and enlist. The more people enlist the bigger our army is the better chance we have of winning. next, they will ask the media to help support the war by putting up advertisements about it and put it on the radio and TV. But also the government will take our freedom of speech away so that we don't riot and go against their decisions about the war.
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They WERE sent to concentration camps during World War Two, so I believe it is True :) I hope this helps!