We follow the integration of European stock markets from the 70's up to today. We do this by using the time series of the stocks that are part of the major European stock market indices in order to calculate the correlations between them and to build graphs where separation between stocks is given by a distance obtained from correlation. The US stocks of the S&P 500 and the Japanese stocks of the Nikkei 225 are used as control parameters. What we see is that European stocks of different countries begin to merge in the same cluster in time.

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