Question: when did britain become the most powerful empire
Answer: By 1913 , the British Empire held sway over 412 million people , 7001230000000000000 ♠ 23 % of the world population at the time , and by 1920 , it covered 35,500,000 km ( 13,700,000 sq mi ) , 7001240000000000000 ♠ 24 % of the Earth 's total land area .