This dictionary serves as a comprehensive reference tool designed to provide precise, factual information regarding the major political, social, and military developments that have shaped the global landscape from 1900 to the present day. Jan Palmowski, a recognized scholar in contemporary history, compiles this extensive volume to offer a structured overview of international events, key figures, and institutional shifts. The work utilizes a systematic, alphabetical entry format to synthesize complex historical data into accessible summaries for students, researchers, and general readers.

Experts and academic reviewers frequently cite this volume as a foundational reference text due to its rigorous factual accuracy and breadth of coverage. Readers often note the density of the information provided, which makes it a highly efficient tool for quick verification of historical facts and timelines.