Estonian kroon until the Soviet invasion in 1940 and Estonia's subsequent incorporation into the Soviet Union when it was replaced by the Soviet ruble. After Estonia regained its independence, the kroon was reintroduced in 1992. The kroon became the currency of Estonia on 1 September 1928 after having been a unit of account since 1924. It replaced the mark at a rate of 100 mark = 1 kroon. The kroon was subdivided into 100 sent. In 1924, the kroon was pegged to the Swedish krona at par, with a gold standard of 2480 kroon = 1 kilogram of pure gold. The standard
Economic and Monetary Union of the European Union Kingdom, whose EU membership predates the introduction of the euro, have legal opt outs from the EU Treaties granting them an exemption from this obligation. The remaining seven non-euro member states are obliged to enter the third stage once they comply with all convergence criteria. The idea of an economic and monetary union in Europe was first raised well before establishing the European Communities. For example, the Latin Monetary Union existed from 1865-1927. In the League of Nations, Gustav Stresemann asked in 1929 for a European currency against the background of an increased economic division due to a number of