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He moved to Chicago, Illinois in 1847, and was the founder, with his brother Leander, of the McCormick Harvesting Machine Company which became part of International Harvester Corporation in 1902.
In 1902, the company merged with the McCormick Harvesting Machine Company to form International Harvester.
In Chicago Cyrus, Leander and their brother William founded what became the McCormick Harvesting Machine Company and eventually International Harvester.