Goa Liberation

On the 19th of December 1961, history was made when the Indian army, led by Brig Sagat Singh, declared complete victory against the Portuguese forces in Goa. For more than 450 years, Goa was ruled by the Portuguese. As a result, every year on December 19th, Goa commemorates its independence.

Why did Goa had to wait for 140 years before getting freedom from the brutal Portuguese?

https://www.indiafaith.in/Encyc/2021/12/18/Goa-Liberation-Day.html

https://www.indiafaith.in/Encyc/2021/12/18/Goa-Liberation-Day.html