Answer:
C.
Vietnam is country number 3.
Four sitting presidents have been killed, all of them by gunshot: Abraham Lincoln (the 16th President), James A. Garfield (the 20th President), William McKinley (the 25th President) and John F. Kennedy (the 35th President).
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</span><span>he was concerned about certain other nations obtaining nuclear missiles
</span><span>President Bush announced that he feared and worried about obtaining nuclear weapons from other nations, which motivated his intentions to build a defense against missiles.
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Answer:
it is b. the civil war ended .
