Which event allowed britain to focus its military resources against the united states

The end of the 7-Years War and the hostilities with France allowed the British to first regroup and then see the colonies in the US as a resource suck. Once the colonies failed to get in line, the British were able to send in troops.

i really dont know the answer

answer; /// slavery should be outlawed in the new country, was part of the initial draft of the declaration of independence, but not part of the final