Official language after unifying the country in 221 BC. Classical Chinese would remain the standard written language for the next 2000 years. Standardization of the spoken language received less political attention, and Mandarin developed on an "ad hoc" basis from the dialects of the various imperial capitals until being officially standardized in the early twentieth century. According to an undated chart by the American pro-English-only organization known as U.S. English, 178 countries have an official language at the national level. Among those, English is the most common with 67 nations giving it official status. French is second with 29 countries, Arabic is
Official languages of the United Nations Japan, who was also Under-Secretary-General for Communications and Public Information. In 2010, the UN's Department of Public Information announced an initiative of six "language days" to be observed throughout the year, one for each official language, with the goal of celebrating linguistic diversity and learning about the importance of cross-cultural communication. The days and their historical significance are: UN independent agencies have their own sets of official languages that sometimes are different from that of the principal UN organs. For example, the General Conference of UNESCO has nine official languages including Hindi, Italian, and Portuguese. The Universal Postal Union has