If you don't have options then there could really be a variety of options. The Japanese bombing of pearl harbor, the atomic bomb, the lend-lease act, the destroyers for bases deal with Britain, and much more.
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With so much warfare and enemies holding dangerous acts against it. America needs to look strong and stable enough to keep the barrier of the state of mind that "if you test us, it's the wrong move, we are a strong nation". No country would like to seem weak especially when it comes to enemies.
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Colonists suffered greatly and called the winter the "Starving Time."
The declaratory act is what gave parliament the right.