I believe the answer is: They protect justices from political pressure.
If supreme court is replaced every time the president is changed, the chosen supreme court would most likely feel pressured to conform to the will of the political parties that help his/her election. To prevent this, the supreme court is appointed for lifetime.
One could argue that this statement is true. In the United States, the international slave trade was outlawed in 1808. Along with this, the 13th amendment made slavery illegal as of 1865.
France got rid of slavery right before the 19th century began, as it became illegal after 1794. Slavery also became illegal in Great Britain during the 19th century. Slavery in Britain was outlawed as of 1833. These three examples show the decline of slavery in the 19th century.
It would be C For the correct answer
The north had a much larger wave of immagration then the south did.
