Final answer:
Winston Churchill anticipated that the United States would carry on the fight against Germany if Britain's defenses were to fail. His speeches and the RAF's stand during the Battle of Britain both inspired and fortified the resolve to defend democracy and resist fascism, influencing the eventual American support.
Step-by-step explanation:
If Britain's defenses were to fail, Winston Churchill anticipated that the United States would carry on the fight against Germany.
During the dire times of World War II, as Britain stood alone in Western Europe after France had fallen to Germany, Churchill took on the role of Prime Minister and led the nation with resolve.
He famously proclaimed that Britain would continue fighting against the Axis powers, emphasizing his commitment with the declaration: "We shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills; we shall never surrender."
This sentiment was a rallying cry for perseverance against the German onslaught and an implicit trust that the fight for democracy would be taken up by others, notably the United States, should Britain fall.
In the midst of isolationist sentiment in the United States, where military aid was a contentious topic, Churchill and President Franklin Roosevelt shared an understanding of the grave threat posed by Nazi Germany.
When the British defenses held against the seemingly unstoppable German military machine during the Battle of Britain, the RAF's heroic stand served as both an inspiration and a symbol of defiance that resonated across the Atlantic, contributing to American support.