What challenges did they face at the end of the world war 2

Debt. Rebuilding of countries.

Great Britain was almost bankrupt after the war. Rationing continued in the country for some time as well. Though at peace, the country began to lose its foreign colonies. As a direct result of the war, Great Britain lost its status as a world leading economy.

The Soviets dominated all the war torn countries of Eastern Europe, Including a dissected Germany, for the next 40 years. As a result, these countries became satellite communist states, directly controlled by Moscow for the most part.