Final answer:
Great Britain ended salutary neglect and changed its policies towards its North American colonies following the French and Indian War for reasons including the need to raise revenue, asserting control, and burden-sharing.
Step-by-step explanation:
The British abandoned the policy of salutary neglect and changed their policies towards their North American colonies following the French and Indian War for several reasons. Firstly, the war had greatly increased Britain's national debt, and they needed to find ways to raise revenue to pay off this debt. Secondly, Britain wanted to assert more control over its colonies and prevent conflicts with Native American tribes in the newly acquired territories. Finally, the British government believed that the American colonies should help shoulder the financial burden of the war, leading to the implementation of new taxes and regulations.