Did the attack on Pearl Harbor unify America?

What is the name for the main idea behind the settling of western lands by americans in the early-1800s?

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

Afamous line of latitude is the north pole. true or false