which city served as the joint capital of assam and meghalaya until assam shifted its capital to dispur in 1972

The city that served as the joint capital of Assam and Meghalaya until Assam shifted its capital to Dispur in 1972 was Shillong. Shillong was the capital of Assam since colonial times and continued as the capital of both Assam and Meghalaya until Meghalaya was carved out as a separate state in 1972. After Meghalaya's formation, Shillong became the capital of Meghalaya, and Assam shifted its capital to Dispur (a locality in Guwahati) in 1972-1973.