New Imperialism, period of intensified imperialistic expansion from the latter half of the 19th century until the outbreak of World War I in 1914. The renewed push to expand territorial control included not only the earlier colonial powers of western Europe but also newcomers such as Germany, Italy, Japan, Russia, and the United States.
He founded the meatpacking company "Armour and Company" in Chicago in 1867, which matches the American businessman and 19th century parts of your question. I hope this helps!