Reply #4: My initial reaction was to vote "No" on the poll...

[spin]

and so I did.

I have to admit that I was surprised to find that 66% of the responders agreed with me.

I seriously doubt that the private weapons that citizens of the United States provided made any real difference to Hitler's planning of an invasion.

Perhaps this extract from "Hitler and the English by Fritz Hesse", best summarizes why Hitler didn't invade Endland.

For the reader to understand this, I must repeat that Hitler, according to my own observations, was inspired by a strange love-hatred of England. He admired the British empire and repeatedly pronounced it the greatest wonder-work every wrought by God. He was convinced the British were permeated through and through by Germanic conceptions of honour and that they would be his allies some day. He attributed the hostility that they felt towards Germany and his own person, and, in particular, towards the National Socialist party, to American and Jewish machinations.

Even while we were working on the peace proposals, Ribbentrop asked me if I thought the British would fight on if the invasion succeeded. I told him I was convinced that the British would fight to the last man. It seemed to me that Churchill could never be forced to give way even by a successful invasion. From the reports of our agents, I gathered that, if the invasion succeeded, Churchill would transfer the government to Canada and continue the war.

I also told Ribbentrop that, in my opinion, the invasion might lead to intervention on the part of the US, so that it would be no more than a pyrrhic victory and perhaps not worth the sacrifices it would cost us. I expressed the view that only a war of attrition, lasting for years, with ever-renewed willingness to come to terms, could, in the end, compel the British to recognise our ascendancy on the continent and make peace with us.

Edited extract from Hitler and the English by Fritz Hesse, translated by FA Voigt (1954). Hesse was a press attaché and diplomat at the the German embassy in London
http://www.guardian.co.uk/world/2009/sep/06/hitler-invasion-of-britain