Which economic union was formed in 1958 and led to the emergence of multinational markets?

European Economic Community/Union

Explanation:

According to my research on historical events of 1958, I can say that based on the information provided within the question the union that is being mentioned is the European Economic Community/Union. This union's main goal was to accomplish economic integration with all of its founding members, which were Belgium, France, Italy, Luxembourg, the Netherlands and West Germany. This created a passage for the emergence of multinational markets.

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