Sylhet was declared as a district of Assam in-

 Sylhet was declared as a district of Assam in 1874. Before that, it was a part of Bengal Presidency.

The district of Sylhet was created by the British colonial government in 1874. The decision to create the district was made in order to facilitate the commercial development of the region. Sylhet was a major center for the production of tea and jute, and the British government believed that the creation of a separate district would help to boost the economy of the region.

The district of Sylhet was initially divided into five subdivisions: Sylhet, Karimganj, Maulvibazar, Habiganj, and Sunamganj. The district was also home to a number of autonomous hill districts, including the Khasi and Jaintia Hills, the Garo Hills, and the Naga Hills.

The district of Sylhet remained a part of Assam until the independence of India in 1947. After independence, the district of Sylhet was divided between India and Pakistan. The western part of the district, including the city of Sylhet, was merged into the Indian state of Assam. The eastern part of the district, including the Karimganj subdivision, was merged into the Pakistani province of East Bengal.

The district of Sylhet is now a part of the Indian state of Assam. The district is home to a population of over 10 million people, and it is one of the most populous districts in Assam. The district is also one of the most economically important districts in Assam, and it is a major producer of tea, jute, and other crops.