Before revision: The main European countries active in this form of colonization included Spain, Portugal, France, the Tsardom of Russia (later Russian Empire amd Soviet Union), the Kingdom of England (later Great Britain), the Netherlands, Belgium and the Kingdom of Prussia (now mostly Germany), and, beginning in the 18th century, the United States.
After revision: The main European countries active in this form of colonization included Spain, Portugal, France, the Tsardom of Russia (later Russian Empire and Soviet Union), the Kingdom of England (later Great Britain), the Netherlands, Belgium and the Kingdom of Prussia (now mostly Germany), and, beginning in the 18th century, the United States.