Firstly, large holdings of US dollars entered Europe shortly after WW2. This was a result of the fixed exchange rate system that lead to more countries using US dollars for trade, as well as increased imports into the US itself from Europe. Moreover, the US provided economic aid to European nations after WW2 in the form of damage assistance under the US governments' Marshall Plan. Secondly, after WW2 communist governments including the Soviet Union and China transferred their holdings held in the US over to European banks. This is believed to have been done for two primary reasons; (1) over fears that US authorities will seize their assets, and (2) to accumulated goodwill with Eurobanks as a strategy to nurture a future source of loans and funding. Thirdly, the 1957 sterling crises forced the UK's strongest movement toward alignment with the Bretton Woods plan. Here, the Bank of England banned sterling-financed trade for non-sterling countries as a result of a sharp increase in the bank rate to 7%, compelling London-based banks to join the rest of the world and use dollars for trade. This alongside the demand for other types of eurocurrencies outside of their home markets lead to the innovation of the eurocurrency market.