Calhoun was vice president of the United States in 1824 under John Quincy Adams and was re-elected in 1828 under Andrew Jackson. Jackson was for the Tariff of 1828 and caused Calhoun to be opposed to Jackson, which led to Calhoun's resignation in 1832.
Environmentalists study the best ways to protect the environment from harmful pollution. they also assist the general public in ways to learn to make the best use of natural resources.
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