Prescott Bush was a partner of Brown Brothers Harriman & Co and director of Union Banking Corporation which had close relations with German corporate interests including Thyssen Steel, a major company involved in the Third Reich’s weapons industry.
“…[N]ew documents, declassified [in 2003], show that even after America had entered the war [December 8, 1941] and when there was already significant information about the Nazis’ plans and policies, he [Prescott Bush] worked for and profited from companies closely involved with the very German businesses that financed Hitler’s rise to power. It has also been suggested that the money he made from these dealings helped to establish the Bush family fortune and set up its political dynasty” (The Guardian, September 25, 2004)
Without US support to Nazi Germany, the Third Reich would not have been able to wage war on the Soviet Union. Germany’s oil production was insufficient to wage a major military campaign. Throughout the war, the Third Reich relied on regular shipments of crude oil from US Standard Oil owned by the Rockefeller family.
The main producing countries in the early 1940s were: the United States (50% of global oil production), the Soviet Union, Venezuela, Iran, Indonesia, and Romania.
Without a steady supply of oil, Germany would not have been able to conduct Operation Barbarossa which was launched on June 22, 1941. The invasion of the Soviet Union was intent upon reaching and taking control of the oil resources of the Soviet Union in the Caucasus and Caspian sea regions: the oil of Baku.