By 1910, what percentage of the population immigrating to the united states was made up of southern and eastern europeans?

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Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

During the era of european expansion, what was the biggest reason for spain’s push for exploration?