18981921

18981921 is a concatenation of two calendar years, 1898 and 1921. In reference works it is sometimes used as a compact label for a historical interval spanning those years. There is no single, widely recognized topic associated with the exact string; its meaning depends on context and whether a discussion is about a period, a dataset, or a code.

Historical scope: The interval covers late imperial and early modern transitions. In politics and war, the period includes the concluding phase of the 19th-century imperial order, the outbreak and course of World War I (1914–1918), and the upheavals that followed, including the Russian Revolution of 1917. It also encompasses postwar diplomacy, such as the 1919–1920 peace settlements, and the early attempts to construct new international structures. In other regions, nationalist movements, social reforms, and economic modernization accelerated during these years.

Legacy and usage: The dates are used in historical datasets, scholarly chronologies, and some cultural or literary projects to delimit studies of that era. They are sometimes used in bibliographic identifiers or as a shorthand for a sequence of events spanning the late 1890s to early 1920s. Because the period includes disruptions and innovations—technological advances in transportation and communication, art and literature movements, and shifts in governance—the interval is often studied as a transitional era in modern history.