Same could be said about America, plus they wouldn't exist without the British empire, it would just be many tribes of native Americans co-existing with nature.
Also, Briton did once exist as independent duchies etc and was then unified by whoever and then 'unified' with Scotland.
English
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They still didn't wield much power in the continet
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Britain was an empire. It controlled all of Australia, India, and a large portion Canada. They also controlled many Caribbean islands. You say that they were oppressive yet completely ignore the oppression Rome carried out. Sorry but Britain commanded an empire.
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Rome didn't take the riches of India
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So? Nowhere did I say Rome took India.