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New electric lights and powerful machinery allowed factories to run twenty-four hours a day, seven days a week.

The realities of urban dwellers’ lives varied dramatically based on where they fell in the social chain.

Which of the following orbitals are not possible?

The familiar phenomenon of a rainbow results from the diffraction of sunlight through raindrops. Which of the following colors would have the highest frequency?

Which element is represented by the orbital diagram below?

Which of the following brought the majority of Chinese immigrants to the United States during the western expansion?

Americans were overwhelmed by the rapid pace and scale of change at the close of the nineteenth century.

Which of the following describes the U.S. Army’s actions after the Sioux victory at Little Bighorn?

While some pioneer women found extra employment in nearby settled towns, most worked on the farms on which they lived.

Which of the following describes the Battle of Wounded Knee?