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A college student reports using nicotine gum to stay focused during final exams. She notes improved concentration and memory while studying, especially after chewing a piece of nicotine gum. She has no prior history of nicotine use. Which mechanism best explains the student’s reported cognitive enhancement? 

The introduction of the [BLANK-1] revolutionized the processing of cotton and significantly boosted production.

Match the following social structures or movements with their descriptions during the Cotton Revolution.

By what percentage did the production of cotton increase in the United States between 1800 and 1850?

What consequence did the annexation of Texas have on U.S.-Mexican relations?

Which event resulted directly from the desire for expansion into Texas?

What social structure emerged in the South as a result of the Cotton Revolution?

Match the following laws or events with their effects on westward expansion.

What impact did the completion of the transcontinental railroad have on westward expansion?

Who was the U.S. President during the Mexican-American War?