becoming the independent nation of Bangladesh in 1971. In 1950 the Princely State of Cooch Behar merged with West Bengal. In 1955 the former French enclave of Chandannagar, which had passed into Indian control after 1950, was integrated into West Bengal; portions of Bihar were also subsequently merged with West Bengal. Both West and East Bengal experienced large influxes of refugees during and after the partition in 1947. Refugee resettlement and related issues continued to play a significant role in the politics and socio-economic condition of the state. During the 1970s and 1980s, severe power shortages, strikes and a violent Marxist–Maoist movement by groups known as the Naxalites damaged much of the city's infrastructure, leading to a period of economic stagnation and deindustrialization. The Bangladesh Liberation War of 1971 resulted in an influx of millions of refugees to West Bengal, causing significant strains on its infrastructure. The 1974 smallpox epidemic killed thousands. West Bengal politics underwent a major change when the Left Front won the 1977 assembly election, defeating the incumbent Indian National Congress. The Left Front, led by the Communist Party of India (Marxist), governed the state for the next three decades. The state's economic recovery gathered momentum after the central government introduced economic liberalisations in the mid-1990s. This was aided by the advent of information technology and IT-enabled services. Beginning in the mid-2000s, armed activists conducted minor terrorist attacks in some parts of the state. Clashes with the administration took place at several controversial locations over the issue of industrial land acquisition. This became a decisive reason behind the defeat of the ruling Left Front government in the 2011 assembly election. Although the economy was severely damaged during the unrest in the 1970s, the state has managed to revive its economy steadily throughout the years. The state has shown improvement regarding bandhs (strikes) and educational infrastructure. Significant strides have been made in reducing unemployment, though the state suffers from substandard healthcare services, a lack of socio-economic development, poor infrastructure, unemployment and civil violence. In 2006 the state's healthcare system was severely criticised in the aftermath of the West Bengal blood test kit scam. Geography West Bengal is on the eastern bottleneck of India, stretching from the Himalayas in the north to the Bay of Bengal in the south. The state has a total area of . The Darjeeling Himalayan hill region in the northern extreme of the state