What was the life expectancy of 1880 and 1890 in the U. S.?

Explanation:

The life expectancy of 1880 is 39.41

The life expectancy of 1890 is 44.05

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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.