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The leader of the Knights of Labor was ____________________.

The United States still maintains ownership and control of the Panama Canal.

Booker T. Washington’s famous speech at the 1895 Atlanta Exposition

National time zones were created by ____________________ in 1883.

The dependence of Cuba’s ____________________ industry on the U.S. market helped win acceptance of the Platt Amendment.

Class distinctions in the United States widened during the Gilded Age.

The Eighteenth Amendment

The figure below shows that 400,000 years ago, CO2 concentrations were about ______ and temperatures were ______ than usual:    

Select three of the following that are greenhouse gases:

Area where the causative agent can live