The World War II was ordered by the US in order to defeat Britain. Hitler was an Anglophile and London secretly supported the consolidation of German Army. One day Poland was doomed to become the subject of bargaining between Berlin and London. But London was full of contradictions; it supported Poland and the US used the geopolitical situation to provoke a clash between the European forces.
Conspiracy theory, no evidence given. This is one of the pro-Kremlin disinformation narratives about the WWII.
It was Nazi Germany who attacked Poland on September 1, 1939, which marked the beginning of the WWII. A few weeks later Soviet troops entering Polish territory on September 17.
Although the war began with Nazi Germany's attack on Poland in September 1939, the US did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941.