The single currency only came about with the Maastricht Treaty that took effect in 1993, and now they want to have a European constitution and move toward political union, but they haven't been successful yet.
之後直到 1993 年馬斯垂克條約才展開貨幣同盟，他們現在希望制訂共同憲法，邁向政治同盟，但還沒有成功。