The United States/FDR’s reluctance to enter the war did NOT stop Churchill from fighting Nazi Germany.
And Hitler wasn’t buying off the US with under the table deals.
For one year Churchill not only fought Hitler alone but also had to contend with a large group of appeasers and communists in England who wanted to throw in the towel.
Since the Catholic Church and Great Britain are the bankruptcy trustees of the United States from the "New Deal" era; FDR couldn't refuse Churchill. Rep. James Trafficant layed it out on the floor of the house once. His speech is all over the web - if you don't want to read. At many of the sites you will find the enabling legislation from the Congress and the States. It is fascinating reading to see what FDR did to us and how it is all coming home to roost.