Germany expected to use its big U-boat fleet to block shipping to the the Allies in Europe, but the US was building Liberty ships so fast that Germany only managed to sink about 10-15% of them.
The massive amount of weapons and ammo and other supplies that those ships delivered was a big part of enabling the Allies to win. With the ships being made too fast for Germany to stop that shipping, and the US being too far away for Germany to attack the factories, they were screwed.
Germany expected to use its big U-boat fleet to block shipping to the the Allies in Europe, but the US was building Liberty ships so fast that Germany only managed to sink about 10-15% of them.
The massive amount of weapons and ammo and other supplies that those ships delivered was a big part of enabling the Allies to win. With the ships being made too fast for Germany to stop that shipping, and the US being too far away for Germany to attack the factories, they were screwed.