Why was the government so eager to promote the growth of railroads?

If one thinks illegal immigrants should become american citizens, should they become american citizens automatically or should there be a waiting period?

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