The disguise was mostly symbolic in nature; they knew they would be recognized as non-Indians. The act of wearing “Indian dress” was to express to the world that the American colonists identified themselves as “Americans” and no longer considered themselves British subjects.
A. Benjamin Franklin
They were united by a political cartoon that was made by him.
Since they needed workforce and the natives were uncooperative, the portuguese used their vast number of colonies in Africa to "import" workers