The basic constitutional issue resolved by the civil war was the

1)expansion of the president's war powers
2)extension of the right to vote to all adults
3)supremacy of federal authority over the states
4)civil liberties of citizens during wartime
listen

The basic constitutional issue resolved by the Civil War was the supremacy of Federal authority over the states. The correct option among all the options given in the question is option "3". The American Civil War that is commonly known as Civil War in America was fought between the years 1861 to 1865. It was the war of Independence that the people of America fought against the oppressive British rule. This long fought war was mainly responsible for creating the great country of America.