Why did british rule start to come to an end during the 1940s?

I just had this, its because the Americans started to see all the other countries become free and they wanted to become free to. They also started to not like the way the British treated them.

In 1900, India was part of the British Empire; but by the end of 1947, India had ... Would it start the process that would lead to the break-up of the British Empire? ... Riots did break out and the most infamous was at Amritsar in the Punjab where 379 ... the British would come across as bullies enforcing their rule on the bullied.