At the end of the First World War lost of new countries were made
Some of these worked well; Czechoslovakia, which was rich in natural resources and home to a well-established industry, was a rich country and was politically stable and well respected in European politics
However, there were problems with the others
The Allies wanted to create a strong buffer zone between Germany and the USSR and re-established Poland as a country between these two
However, Poland had no natural barriers, such as rivers or mountains, on its borders so the country was difficult to defend
Poland had been given a strip of German land named the Polish Corridor
This aimed to weaken Germany by splitting it in half, while giving Poland access to the sea, resulting in lots of Germans living in Poland
The USSR also argued about Poland's eastern borders, and Poland was surrounded by enemies who wanted to reclaim its territory