Answer:
Well it would be a hard to find an argument, but the best one would be to stress out the importance of protection that the British soldiers are providing to the colonies. Also, if the colonies are to be spread to the West, they will have to protect themselves from the attack of the Natives.
Step-by-step explanation:
After the French and Indian War Britain gained many territory and also sent a large number of soldiers to the colonies. The enlargement was necessary because the British government believed that they need to protect and keep newly acquired territories. That is why loyalist are supporting them, to preserve peace.