Louis Napoleon Bonaparte's seizure of power was the product of just another coup de etat. One of his guiding principles is found in his deep belief in the power of the middle class and its nationalist connotations with some similarities to the social policies of Bismarck.
Louis was mainly supported by the low classes, the peasants, He used his mandate to abolish the recently created representative assembly, in order to marginalize the liberal factions, finally becoming himself a new emperor in the second middle of the IX th century. Shortly after being in power he restored universal suffrage.
On the other hand: Bismarck’s realpolitik policies were employed in response to the failed revolutions of 1848 as a way of strengthening the state system and tighten social order. As the most famous advocate of Realpolitik, Otto became the first Chancellor, serving in the Kingdom of Prussia. The use of Realpolitik had him achieve Prussian dominance in Germany. Manipulating political issues causing antagonism in other countries and causing or engaging in wars if necessary, "the end justified the means".
The 1896 Supreme Court case which resulted in the "separate but equal" doctrine was Plessy v. Ferguson. Plessy v Ferguson allowed state-sponsored segregation in public facilities, such as bathrooms, public school and transportation. Even when this legislation was scrapped, there were groups in the South still fighting for it to be upheld.
A primary source is a person (or a record produced by a person) who was actually there, as a witness or a participant of the event in question. A secondary source is someone who obtained information from a primary source and who then wrote or spoke about it.