Originally published in Cuba in 1934, Territorial Expansion of the United States is the first and only English translation of Ramiro Guerra y Sánchez's work. "Yankee imperialism" has generally been identified as the period in American history after the war with Spain and the seizure of the Panama canal zone until the advent of the "good neighbor" policy, as declared by President Franklin D. Roosevelt in the 1930's. Guerra is the first historian to point out clearly that "Yankee imperialism" began in the 18th century and continued until the first publication of this book.