the french decided they didnt want a king, and instead they would be like us. yeah right. (they never acheived it)
It was primarily the "Reconstruction Act" that forced states to accept the Fourteenth Amendment in order to join the Union, since this led to a military oversight of the Southern states immediately after the Civil War.
The correct answer to the question above is conservatives. The conservative ones were the one who held the view that the businesses in the nation should be regulating themselves without the government's oversight or guides.
Marbury v. Madison is probably the most important turning point case in the Supreme Court's history as it, arguably, gave itself the power to review law for constitutionality with its ruling.
By establishing judicial review, the Supreme Court gave itself a mission that would define its history for the remainder of its existence.
Dred Scott is a poorly decided case that caused a war but was not a major turning point for the Court. In fact, it took many years for the Court to recognize the error of its ways.