Because they thought of Britain as the motherland and the British Monarch as their own Monarch.
The countries of the British Empire.
The British Empire no longer exists.
Argentina, Chile and Peru were never in the British Empire
They were all part of the British Empire
All non British, countries, colonies, territories or protectorates were not part of the British Empire.
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Click the link below for theTerritorial evolution of the British Empire.
About 50 countries were part of the British Empire. The rest of today's modern countries either didn't exist at the time or were in a different Empire. Some were even independent.
The British Empire ruled more than a third of the world.
At one time some of the countries in Africa were part of the British empire. Now they are independent, but some are members of the Commonwealth of Nations, an organisation that has some of the old British empire countries as members.
Lol? The Romans were WAY before the British Empire! They didn't destroy it, the British were forced to retreat from several countries, and as such simply started to allow the others to leave the Empire, as they couldn't fight all the countries.
About 50