One estimate suggests that, over the course of 200 years, the British extracted from India, at current prices, $45tn. They used this money to fund industrialisation at home and the colonisation of other nations, whose wealth was then looted in turn.
I did once try to track down this absurd number. It’s in one of those academic books that cost $hundreds and I never did manage to read the paper itself. But it’s balderdash even so.
Current UK wealth is around £15 trillion. So how did we nick $45 trillion from elsewhere?
What I think has happened is that Indian (Marxist, possibly even Maoist I think she is) writer misunderstanding, or misrepresenting, how letters of credit work.