A turn-of-the-nineteenth-century real estate ad targeted to immigrant workers says, "Where there was darkness, now there is light." What does this ad imply about the lives of working families?

What mountains did the first transcontinental railroad cross

How has the united states been influenced by other countries ?

Although china's total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation?