the use of Hindi, a language that was adopted to help start formal secular education in the country, in 1964. As a result, at the beginning of the school year in March 1990 the teaching of Nepali language (which share similarities with Hindi) spoken by ethnic Lhotshampas in southern Bhutan was discontinued and all Nepali curricular materials discontinued from Bhutanese schools. In 1988, Bhutan conducted a census in southern Bhutan to guard against illegal immigration, a constant threat in the south where borders with India are porous. Each family was required to present census workers with a tax receipt from the year 1958—no earlier, no later—or with a certificate of origin, which had to be obtained from one's place of birth, to prove that they were indeed Bhutanese citizens. Previously issued citizenship cards were no longer accepted as proof of citizenship. Alarmed by these measures, many began to protest for civil and cultural rights and demanded a total change to be brought to the political system that existed since 1907. As protests and related violence swept across southern Bhutan, the government in turn increased its resistance. People present at protests were labeled "anti-national terrorists". After the demonstrations, the Bhutanese army and police began the task of identifying participants and supporters engaged in the violence against the state and people. They were arrested and held for months without trial. Soon the Bhutanese government arbitrarily reported that its census operations had detected the presence in southern Bhutan of over 100,000 "illegal immigrants" although this number is often debated. The census operations, thus, were used as a tool for the identification, eviction and banishment of dissidents who were involved in the uprising against the state. Military and other security forces were deployed for forceful deportations of between 80,000 and 100,000 Lhotshampas and were accused of using widespread violence, torture, rape and killing. The evicted Lhotshampas became refugees in camps in southern Nepal. Since 2008, many Western countries, such as Canada, Norway, the United Kingdom, Australia, and the United States, have allowed resettlement of the majority of the Lhotshampa refugees. Political reform and modernization Bhutan's political system has recently changed from an absolute monarchy to a constitutional monarchy. King Jigme Singye Wangchuck transferred most of his administrative powers to the Council of Cabinet Ministers and allowed for impeachment of the King by a two-thirds majority of the National Assembly. In 1999, the government lifted