Industrialized countries have a lot of businesses that produce goods in factories. The United States has had an industrialized economy since the 19th century.
When a country's economy changes from agriculture to manufacturing, it becomes industrialized. This often involves the construction of factories that produce large quantities of goods to export, and a shift in people's jobs from farming to industrial labor. The first industrialized economies were formed during the Industrial Revolution. Industrialized is from industry and the Latin root indostruus, "diligent."