English is the current "lingua franca" of international business, science, technology and aviation. It has replaced French as the lingua franca of diplomacy since World War II. The rise of English in diplomacy began in 1919, after World War I, when the Treaty of Versailles was written in English as well as in French. The use of English profited from the important international role of English-speaking nations (the United States and the Commonwealth of Nations) after World War II, particularly in the establishment and organization of the United Nations. English is one of the six official languages of the United Nations (the other five are French, Arabic, Chinese, Russian and Spanish).