I would really appreciate if anyone could give me a brief explanation on any or all of the topics please!

1.) Military, social, political and economic aspects of total war (both WWI and WWII)

2.) The impact of WWI and WWII on borders, empires and international relations.

3.) The fate of 19Century liberalism in the 20th century (think of the new political ideologies that emerge after WWI: Communism, Fascism and Nazism, Social Democracy, Christian Democracy and New Conservatism)

4.) Relationship between individuals and states in totalitarian societies (Soviet Union, Nazi Germany, Soviet bloc)

5.) Western Europe's transformation after WWII

6.) The Cold War and the transformation of the United States after 1945