The proposed textbook is devoted to the history of international relations between the signing of the Peace of Westphalia (1648) and the end of World War II (1945). There are very few textbooks on this period: the Westphalian Tricentennial is considered either as part of the general history of international relations to date, or fragmentary (for example, the history of international relations in modern times or in the twentieth century). The proposed manual attempts to fill this gap.