Why did they end the slave trade

By its Act Against Slavery of 1793, the Parliament of Upper Canada in British North America had abolished the slave trade, and in 1805 a British Order-in-Council had restricted the importation of slaves into colonies that had been captured from France and the Netherlands

Explanation:

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.