|Fuller's IPA, in the English style.|
But the style was not invented in the US. I'll quickly relate its origins:
IPAs emerged way back when, during the height of the British Empire. To satiate her troops abroad, Britain would ship beer to its colonies, most notably India. Utilizing the natural antimicrobial properties of the hop flower, the ale was aggressively hopped with as much as four or five pounds of hops per barrel so that it may survive the long voyage. The style gained popularity in the mid-1800s, then faded away until fairly recently.