To be fair, we tend to take US military help to Europe for granted in retrospect. Both FDR and Churchill fought hard battles at home to ensure the opposition to Nazi Germany, and at the time it is far from obvious that they would succeed. There's also an element of luck to the fact that we had FDR and Churchill at the helm of these countries in these years - weaker leaders would have crumbled like France.

US military involvement in the postwar era has been a fucking mess, but we (Europeans) are eternally grateful for this - far from obvious - determination to help your allies when they're being invaded.

Post script since there's a bunch of Russian shills in this thread: We're grateful for the efforts of the Red Army as well. The fact that Stalin was happy to cooperate with Hitler all the way until the invasion of the Soviet Union, combined with a common distaste for Soviet postwar policies in many liberated areas, however makes our appreciation of the Soviet political leadership at the time a bit more strained. Soviet military tactics were also inefficient and caused unnecessary suffering and losses within the Red Army - history does repeat itself.