Which reason explains why this grievance was
included in the Declaration?

A reason that best explains why grievance was included because the Trade focused on generating income for the Crown only and then the United States Declaration of Independence was entitled to all colonial grievances against King George III by asserting certain natural legal rights.

Explanation:

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Mexico was colonized by Spain

Brazil was colonized by Portugal

Haiti was colonized by France

French Guiana is colonized by France

Santo Domingo was colonized by Spain.

Colombia was colonized by Spain.

Cuba was colonized by Spain.

Suriname was colonized by the Netherlands.

Jamaica was colonized by Britain.

Explanation:

Many of these countries had many influences upon them. For example, French Guiana was colonized not only by the French, but also the British and the Portuguese. Mexico was colonized by Spain for many centuries, but it gained its independence. Brazil declared independence from Portugal, and Haiti did the same to France. New Guiana is currently still is part of France. Furthermore, the Dominican Republic, Colombia, Cuba, Suriname, and Jamaica are all independent.