Did the Nazis/Germans during WWII knew that the USA would eventually invade Normandy beach (D-Day)?

The Allies agreed that the "soft-underbelly of Europe" was not the way to invade Germany. The only way to invade German Occupied-Europe was across the English Channel. Rommel was charged with preparing the European sector of the English Channel to repulse any Allied invasion of German Occupied-Europe.

I was inevitable that the allies would at some point in time cross the channel. This the Germans were not blind to.

The sole reason for the building of seafront fortifications called the Atlantic-wall was to counter and repulse an invasion from the sea.

So the Germans must have had, some idea that an invasion would come from that quarter.

An invasion could come from a number of places Denmark and France were contenders.

Denmark because the area was well suited for the deployment of armour and it had a very flat, wide and long landing area. An invading force could strike at the very heartlands of Germany, but the sea route was very long and air cover, a nightmare.

France at two points, the Pas de Calais or Normandy. The Pas de Calais had all the harbour facilities that an invading force could wish and need, but the Canadian Dieppe Raid proved, as thought, the Pas de Calais would also be extremely fortified.

Normandy was known to be less fortified, but with no harbour facilities that could serve an in invading force. So the allies built the Mulberry harbour. Had the Germans got wig of this project, then it wouldn't have taken them very much time, to workout, from where, the main attack would come.

The Germans made a decision based on the information that they had and the experience's of first class generals, that there was, an over weighing chance, that the allies would cross the Channel by the shortest route. And they got it wrong.

It was 50/50

Actually the Germans were convinced that the point of invasion was the Pas de Calais simply because it is the shortest distance across the channel. The Allies "enhanced" this belief by setting up cardboard trucks and tanks all over eastern England in the months before the invasion.

"The USA" and the British, and Canadians, etc.

The Germans did not think that the main invasion would come via the Normandy beaches. In fact Hitler thought it was sideshow designed to distract, and even after the troops had landed, he held back many German troops who would have been useful in slowing down the British and Americans etc in their first few days on land. The main invasion was expected via the Straits of Dover, the shortest route.

It was a allied operation with more British troops than American.

There was no hiding the build up of troops. Not just Americans. There were even more British, Canadians, Free French etc.

However, they didn't know where the landings would be. They had hundreds of miles of coastline to defend. The allies deceived them into thinking it would be at the Channel's narrowest point.

They knew there would be an invasion by the Allies (more Brits and Canadians than Americans were involved on D-day), but they were not certain where. They assumed that the Allies would need a port in order to supply any landing force – and they were correct in this assumption. But they were unaware that the British had built amphibious harbours (Mulberry) that could be installed at a beachhead and an undersea fuel line (PLUTO) both of which were critical in support of the forces. So although Germany was defending the beaches it had concentrated its forces at or near ports. Their beliefs were bolstered by a campaign of deception by the Allies.

In the months leading up to the invasion, the Allies conducted Operation Bodyguard, the overall strategy designed to mislead the Germans as to the date and location of the main Allied landings. Operation Fortitude included Fortitude North, a misinformation campaign using fake radio-traffic to lead the Germans into expecting an attack on Norway, and Fortitude South, a major deception designed to fool the Germans into believing that the landings would take place at Pas de Calais in July. A fictitious First U.S. Army Group was invented, supposedly located in Kent and Sussex under the command of Lieutenant General George S. Patton. The Allies constructed dummy tanks, trucks, and landing craft, and positioned them near the coast. Several military units, including II Canadian Corps and 2nd Canadian Division, moved into the area to bolster the illusion that a large force was gathering there. As well as the broadcast of fake radio-traffic, genuine radio messages from 21st Army Group were first routed to Kent via landline and then broadcast, to give the Germans the impression that most of the Allied troops were stationed there. Patton remained stationed in England until 6 July, thus continuing to deceive the Germans into believing a second attack would take place at Calais. Military and civilian personnel alike were aware of the need for secrecy, and the invasion troops were as much as possible kept isolated, especially in the period immediately before the invasion.

They new which places could be used for a large-scale invasion, and defended most of those places. They did not have specific information that Normandy would be the main attack.

Their generals knew that a very large invasion force would require certain land features, that the attack would come from the sea (the main attack anyway) and then looked at what was available. Normandy certainly fit the requirements, which made them build fixed defenses along those beaches.

Basically, an educated guess that proved correct.

It was the best military tactic for the invasion to be in Normady, it was the shortest distance between England and France.,