Short answers, pulled from the story.
The first dated mention of Assam appears in the Periplus of the Erythraean Sea during the 1st century. Ptolemy's Geographia followed this reference in the 2nd century, calling the land Kirrhadia after its Kirata population.
The Varmanas governed Assam from c. 350 CE to 650 CE with capitals located in Guwahati, Tezpur, and North Gauhati respectively. All three dynasties claimed descent from Narakhasura and spanned the region east of the Karatoya River.
Sukapha led the Tai-Ahoms to the Brahmaputra Valley under his leadership in the year 1228. He established his capital city on a hillock named Charaideo in 1253.
The discovery of Camellia sinensis occurred in Assam in 1834 while testing took place in London during 1836 and 1837. The region holds about a quarter of India's oil reserves according to recent USGS estimates.
Nagaland became the 16th state of India in 1963 after the Naga Hills district separated from Assam. Meghalaya formed as an autonomous state within Assam in 1970 before becoming a full state in 1972 alongside Arunachal Pradesh and Mizoram.
India released names of 2 million residents determined non-citizens in August 2019 during the citizenship review process. This action deprived them of rights and led to government deportation efforts while detaining 1,000 others same year.