Answer:
An explosion sank the battleship U.S.S Maine, killing 266 of 354 crew members.
They think people need to know
We started the Korean War to prevent the spread of Communism because we associated Communism with Russia and we didn't like Russia.
The Cuban Missile Crisis was Russia getting ballsy and really mad at us (Likely due to us having missiles in Turkey that could hit them)
And the Vietnam War was started for the same reason as the Korean War.
I had this question on my social studies too. The Northwest Passage, I can't tell you what it is but I can tell you some explorers. Those are Giovanni da Verrazano, Jacques Cartier, and Henry Hudson.