What if Hitler did'nt attack Poland?

Would there be a second World War? Would Hitler try to take France and England and would the Russians help Germany?

 

If Hitler had turned West early the Soviet Union would have found its frontiers under no threat and therefore would simply stay put, selling Germany raw materials in exchage with manufactured goods per the commercial agreements. The problem would be what would Poland do, or would Hungary and Romania declare war on each other, etc, etc.