Summarize this:

Excavations trace the origins of the city to around the 4th century and it was the capital of NAME_1 until the 10th century.

The rapidly-growing metropolis has a population of 2.4 million in 2020, and encompasses an area of over 360 km2, making it the largest city in the state and the region. It is the main centre for shopping, retail and business; attracting people from all over the north east as well as from Eastern Bhutan. The slow, meandering Brahmaputra River is a focal point of the city while the lush hills of the Shillong Plateau provide a verdant backdrop for the suburbs.

The pleasant environment, however, is somewhat tempered by the inadequate investment in the region, which is apparent from the low quality of roads. Still, despite the average infrastructure, private investors have been drawn to the city, and there has been something of a boom in the construction of shopping malls and high quality condominiums, which has helped raise the economic profile of the city. The end of decades-long insurgency in NAME_1 has also helped in the economic boom of Guwahati.

This article also covers Dispur, NAME_1's seat of government. In 1973, NAME_1 was reorganized to form the smaller states of Meghalaya, Manipur and Mizoram. NAME_1 lost its capital, Shillong, to Meghalaya. A search for a new capital ensued and the choice settled on Dispur, then a suburb of Guwahati.