They are elements of rule of law
It should be chronological: US Civil War: 1861-1865, Reconstruction: 1865-1877, Progressive Era: 1890-1920s
Triangular trade or triangle trade is a historical term indicating trade among three ports or regions. Triangular trade usually evolves when a region has export commodities that are not required in the region from which its major imports come. Triangular trade thus provides a method for rectifying trade imbalances between the above regions.
The answer is Great Britain!
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