<span>They built up their supply of arms and made agreements to support each other in the event of war.
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<span>By gradually building up the sea power of the US Navy.</span>
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Answer:
The US has a larger immigrant population than any counrty, with 47 million immigrants as of 2015. This represents 19.1% of the 244 million international migrants worldwide, and 14.4% of the U.S. population nation:
