A lot! The majority, surely. The period from the 18th through the close of the 20th centuries was a time of tremendous upheaval, where nations were forged. German students, for instance, don't spend all of their time on the HRE; they tend to focus more on the nation-forming events of the 18th and 19th centuries, and then of course the 20th.

Of course, students also learn ancient and ancient-adjacent history -- the Mesopotamians, Egyptians, Greeks, Romans, Charlemagne, etc. -- but this is general and isn't unique to any national tradition, but common to the entire continent.