India is the largest country in the South Asian subcontinent , and its geographical environment and geographical location are very advantageous. There is a vast Ganges Plain in northern India, with flat terrain and fertile land. It is India's populated area and agricultural base. Southern India stretches deep into the Indian Ocean, has a long coastline, and has many excellent ports.

The Indian Ocean is a key sea area in the world. Trade between Asia, Europe, and Africa mainly passes through the Indian Ocean, and the Persian Gulf belongs to the Indian Ocean Gulf. The oil resources produced here are also transported to all parts of the world through the Indian Ocean. Therefore, India's geographical environment and geographical location are very superior.
However, India’s territory structure is rather special. As can be seen from the map, the northeastern region of India and other regions of India are only connected through the very narrow Siliguri Corridor. The Siliguri Corridor is located between Bangladesh and Nepal. It is about 22 kilometers long and 21 kilometers wide. It is the chokepoint of India.

Except for the Siliguri Corridor, the entire northeastern region of India is an international border and has no coastline, making it very closed. The Northeastern region of India includes six states, namely Meghalaya , Manipur , Nagaland , Assam , Tripura , Mizoram .
There are many differences between the Northeastern region of India and other regions of India. In terms of economy, the Northeastern region of India is the most backward region in India due to its closed terrain and no coastline. In terms of population, the northeastern region of India is dominated by yellow people, which is different from other regions in India. In fact, the current northeastern region of India does not belong to India historically. The previous dynasties in Indian history, including the Mauryan Dynasty, the Gupta Dynasty, the Mughal Empire and other powerful dynasties, did not establish their rule here. So how did the Northeastern region of India become Indian territory?

Historically, the sphere of influence of Indian dynasties has reached as far as Bangladesh. In the eastern region of Bangladesh, there were dynasties established by yellow people in history. During the 12th century, the population of the Dai people living in the Irrawaddy and Salween river basins began to grow on a large scale.
As the population grows, the contradiction between man and land becomes more and more prominent. The Dai people begin to explore surrounding areas, trying to find areas with fertile land and superior environment to live in. However, the journey of exploration was very difficult. At that time, many of the surrounding superior lands were already controlled by the Burmese people. So in the 13th century, they began to migrate westward and finally arrived in the Brahmaputra Valley.

This time, they encountered no obstacles. At that time, the population of the Brahmaputra Valley was very sparse. The local indigenous people were mainly Morans, Nagas, and Bura people. They did not establish a country at that time and still maintained their tribal form. At the beginning of the 13th century, the Dai people migrated and brought advanced production technology and national concepts. They continued to reclaim wasteland, built water conservancy projects, and intermarryed with local aborigines, and the population gradually grew.

1 In 1251, the Dai people established their own country, which was called the Kingdom of Ahong or the Kingdom of Assam. It was called "Mengdun Shunhan" in Dai language. At that time, India was just a geographical term and did not form a unified country. It still maintained a state of h11 and h2h states. After the Age of Discovery began, the British landed in Bangladesh, gradually integrated and controlled the various Indian states, and established a unified British India.

At the beginning of the 19th century, British India began to expand to the northeast, and Myanmar also began to expand to the west. In 1824, the British expelled the Burmese army that invaded the Kingdom of Assam and established a puppet regime there. In the mid-19th century, the British deposed the King of Assam and incorporated the lands of the Kingdom of Assam into British India. This ended the 600-year rule of the Dai people over the Brahmaputra Valley.
After the end of World War II, Britain's national power was damaged. Mountbatten, the last British Governor-General in India, proposed the partition plan of India and Pakistan.In 1947, India and Pakistan became independent respectively. India inherited most of the land of British India, and the Assam region has since become Indian territory. Later, in order to control this area more firmly, India adjusted the divisions. The area of Assam was greatly reduced, forming the current layout.