Why was the indian national congress created? what progress did they make gaining india their independence back?

It was created as a way for the indians to voice thier concernsa nd express thier opinions and views, it was established in 1885, they mainly depabted at the time econimc reforms and how to expand thier role in making the bristish policy for Inida. The indians basically added to the process of laying down ground rules and treaties and what not.