Which countries were powerful in the past but no longer are?

The British Empire was an enormous multi-mainland Empire that extended from Canada to New Zealand, had the second biggest populace (China was still #1).

After some time it didn't lose domains, they slowly expanded their development of regions overall particularly India and Africa, however after World War II the vast majority of them were given freedom because of decolonization endeavors by the UN.

These days the United Kingdom of Great Britain and Northern Ireland is as yet a power to not be deal with as it has a lasting seat in the Security Council which is decent approach to state it's as yet a considerable force.