What lessons could our contemporaries learn from the current international situation at the turn of the 19th and 20th c?

The 19th century is a time when the political structure of states is changing. Absolute monarchies are becoming a thing of the past, giving way to limited (constitutional) monarchies and republics. Parliamentary activity is actively developing. The process of formation of rule-of-law states is underway, where legislative, executive and judicial powers are divided. Such states guarantee individual rights, proclaim the equality of citizens before the law.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.