Here is the concept for a unique feature for a digital GDZ (solution guide) based on the of the Agibalova & Donskoy 6th-grade history textbook: The "Historical Context Bridge" Feature
Because historical interpretations have evolved significantly since the late 90s, every answer would include a "Modern View" toggle. It would explain how historians today view topics like the Christianization of Rus' or the Fall of Rome compared to the 1997 text. gdz po istorii 6 klass uchebnik agibalova donskoi 1997 goda
Агибалова Е.В., Донской Г.М. История Средних веков. 6 класс Here is the concept for a unique feature