Why did Britain fall into dept after 7 years of war?

They did not have enough money to fight the war from the beginning. They had to get monetary help from the US and other countries. They were fighting the war in South East Asia, the Pacific, The Atlantic Ocean, Africa, and Europe. They had to get evacuees to other places. They did not have enough natural resources so they had to get ships and many other war implements from the US and elsewhere. The had to transport troops around the world. This was very expensive. So the US and other places gave them many decades to pay them back. They did it too. This is amazing for a an Island that is smaller than the US state of California and part of Nevada.