It was under Portugeuse rule for hundreds of years. The U.N. Trusteeship Council would probably have transferred it to India eventually, but India preferred conquest instead. India's action ruined the U.N.'s system of peaceful arbitration of such disputes and thus created a gunpowder keg in Kashmir that Pakistan was soon to light and probably encouraged the Chinese attack before that (the sparseness of period Chinese records from this period does make this claim uncertain but it is plausible.
Before that Indian kings ruled that region for thousands of years. Also it was not an invasion, but a reclamation, liberation.
The liberation of Goa was in 1961, whereas damage in Kashmir had already been done before that.
Goan war not invasion, but liberation. Something like GWB said about Saddam's iraq.