By 1920 what percent of americans lived in cities

51% I'd say. About half.

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answer: francis bacon is well known for being the secont man to sail around the world. sir francis drake was the first englishman to sail around the world.

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ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.