Im pretty sure one of the main reasons is because of the treaty system
Explanation:
Severe war reparation payment by Germany
Answer:
the russians practiced communism where as the west (usa,britain,france) were anti communist. the us were capitalists , thus is would make sense that the ussr and the usa would clash eventually despite their pasts of helping eachother out. once russia clashed with the west it gave way to the cold war
Augustus, Tiberius, Caligula, Claudius, and Nero.