What was a major result of the civil war?
(1) the judiciary became the dominant branch of
the federal government.
(2) congress passed an amendment to provide
for the direct election of senators.
(3) the power of the central government was
strengthened.
(4) states were given the right to secede from the
union.

The correct answer is 3) The power of the central government was strengthened.

After the Civil War, the federal government had the ability to reconstruct the South in order to allow the Confederate States into the Union. This ability to oversee the South to ensure that amendments like the 13th and 14th amendment were being enforced gave the federal government more power than it had ever had before.