Just give your best description of the Nazi attempt of America. But remember that America would not have the equipment or nuclear warheads it has today because it would not have come out of the Great Depression of it just has. Add alternate weapons or veichles but no nuclear holocaust.
On the
very off chance you are serious, and we are talking 1939-40, the Kreigsmarine is found, fixed, and defeated by the USN at roughly 40W by 50N. In 1939 The Kriegsmarine consisted of two BC with 11" guns, two panzerschiff (armored cruisers) with 11" guns, two Hipper class CA, six obsolecent CL, none mounting more than 8 5.9" guns, eleven Destroyers, and a total of 57 U-boats, of which roughly half were ocean going. By the end of 1940 the Germans add the
Bismarck , an additional
Hipper, and a single Type VIIC u-boat. This is an insufficient sized fleet to provide both a covering force and close escort for any invasion convoy.
U.S. Navy could deploy 15 battleships, all 14" guns or larger (seven assigned to Atlantic Fleet), 5 carriers (two assigned to Atlantic Fleet), 18 CA (seven assigned to the Atlantic Fleet), 17 CL, including seven
Brooklyn class, any two of which out gunned ALL the Kriegsmarine CL's in aggregate (seven assigned to Atlantic Fleet), 200+ destroyers (including 63 less than five years old) with roughly 50 in the Atlantic, and 97 ocean going subs. It should be pointed out that, thanks to the Panama Canal, the USN can concentrate most of it's fleet (especially carriers, cruisers and destroyers) in either ocean with somewhat startling speed. In 1940 the USN added a CV, 10 DD, and two subs. This allows the U.S. to create at least four, perhaps as many as six, heavy surface action groups, centered on at least one, perhaps as many as three battleships, with as many heavy crusiers in each group as the Kreigsmarine possessed. After this was done, the American fleet could also put together several very fast (33+ knot) cruiser centered forces, with 4 - 6 DD in each unit, while leaving sufficent escorts to build three carrier task forces,. That is at least seven hunter groups that can individually destroy the German invasion force, with three or four others capable of wrecking it in detail
Lastly, the German force would be operating outside of any sort of aircover, while the U.S. could, just from her five carriers, put better than 100 attack aircraft and a similar number of fighters into the air. When land based aircraft, from fighters to B-17 bombers are included, the U.S. can also put around 700 additional aircraft into the air (including obsolecent, but still battle worthy in a non-fighter enviroment, aircraft). The American sub force can be used to create numerous patrole lines, while leaving 40+ boats to defend the American coast.
You will note that I have not included any Royal Navy vessels. It would be shocking if a substantial number of them were also not available to augment the American fleet.
Given these sorts of numbers, what do you think would happen?