Because of the good green grass that there is.
America originally desired to remain neutral in WWI. However through submarine warfare, the Germans sunk the British Lusitania cruise, which contained American passengers. The US President Woodrow Wilson still remained neutral however, the US intercepted a telegraph from Germany to Mexico that implored Mexico to attack the US. The Germans were fearful of US entry and tried to distract the US, and this telegraph became known as the Zimmerman Telegraph. Afterwards, the US finally entered war on the Allied side.
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The 2010 Census reported 308.7 million people in the United States, a 9.7 percent increase from the Census 2000 population of 281.4 million.
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