The theory that was used to justify claims of racial superiority was <u><em>social Darwinism.</em></u>
Social Darwinism was a group of ideologies that arose in the late 1800s in which Charles Darwin´s theory of evolution by natural selection, was used to justify certain social views.
According to the theory, the weak were diminished while the strong grew in power over the weak.
One of the persons who adopted social Darwinism was Adolf Hitler, who considered that the German master race had grown weak due to the influence of non-Aryans, so he targeted certain groups of people that he considered biologically inferior for extermination such as jews, homosexuals, etc.
First off, the Allies warned Japan TWICE about the bombings. Also the use of the two atomic bombs finally forced japan to surrender bringing an end to the war and brutal Japanese colonialism era in Korea, parts of China, Philippines, Indonesia and many more. (Japan committed many war crimes in these countries).
Following WW2, Germany was dissolved into two halves: East and West Germany, the Eastern portion was held by the USSR (Russia), while the Western portion was controlled by France, the US, and the UK. This began the Cold War, where nuclear and political tension took place between the opposing sides. While its Western counterpart was Capitalist and Democratic, East Germany was Communist. Hope this helps!
Well in the 1850's was a significant time where slavery occurs. As you probably know slavery was terrible on so many levels. Becuase of the different opinions on slavery their political values changed., Some values thought that slavery was okay while the other fought against it saying that slavery should end. Different sections such as Indiana and Illinois has strong opinions to keep slavery including the south when the rest of America did not feel so strongly.