Feudalism was an oppressive government system; once you were born into a class, you stayed there. There was very little social mobility, so it’s quite apparent to see why only the royals and nobles would benefit from such.
Dred Scott would remain a slave and, as a slave, was not a U.S. citizen and was considered property. The Chief Justice of this case, John Marshall, said that Scott shouldn't have even brought his case to court because he is a slave.
Allies were made during World War I. America, Britain, France and Russia banded together against the Axis which was led by Germany and included Austria-Hungary, Bulgaria, etc. The war was said to have started with the killing of Franz Ferdinand and wife. Austria-Hungary set to revenge the death of their Archduke with Germany by their side. France, Britain, and others were on defense. Germany said that they did not start the war but they ended up invading Belgium and France and kept war going.