Britain didn't have enough settlements to enforce the claim.
They felt endangered because they knew that the government would try to abolish slavery.
For example look at Vietnam. Thousands of Americans lost their lives due fighting down there. When LBJ was president civilian people and soldiers wanted the US out of the war at any cost. Due to him not pulling them out people started to think that the government wasn’t on their side in this matter or didn’t listen.
A. The INC was mostly made up of middle-class people with no following.