The article explores the early American Empire from 1754 to 1865, focusing on its origins, challenges, and expansion. It discusses the formation of the American empire and union, the struggles faced in the late 1700s, and the concept of the 'Empire of Liberty'. The research delves into the pursuit of hemispheric dominance, the expansion into territories like Canada, Oregon, California, and Texas, and conflicts with Britain and Mexico. It also covers the period of disunion and the imperial crisis of 1861-1865.