Why was the British empire so powerful?

Why was Britain/UK/England so powerful? Sea power, merchants, and luck. ... The more money came into Britain, the more money they could put into their navy, which then could protect the trade lanes, allowing more trade, which meant more money. After defeating Napoleonic France in 1815, Britain became the world's only superpower for more than a century. The empire became even larger. Though the British Empire had been the most powerful economy before the war, it was quickly surpassed by the United States as the greatest industrial power after the war.

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