During the late 19th and early 20th centuries, America transformed into an industrialized nation dominated by big businesses as the economy shifted from small, personal operations to large corporations. Companies integrated vertically by combining mass production with distribution and horizontally by merging into larger conglomerates. Big businesses arose through separating ownership from day-to-day management and establishing centralized administrative offices to oversee increasingly large and complex industrial operations. In contrast, big business developed more slowly in Great Britain, placing it at a competitive disadvantage in the global economy of the 20th century.