Final answer:
Henry Clay's plan to unite the west was called the American System and involved implementing a protective tariff, a national bank, and internal improvements.
Step-by-step explanation:
Henry Clay's plan to unite the west was known as the American System. This plan aimed to promote economic growth and national unity by implementing three main policies: a protective tariff to protect American industries, a national bank to stabilize the economy, and internal improvements such as building roads and canals to connect the Western frontier with the rest of the country.
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