18651941

1865–1941 refers to a historical span that covers the latter half of the 19th century and the first half of the 20th, a period of rapid industrialization, political upheaval, and global conflict. The starting point includes events such as the end of the American Civil War in 1865 and the abolition of slavery in the United States, as well as ongoing industrial expansion and social reform movements in many countries. The latter half of the 19th century saw modernization processes in Europe, North America, and elsewhere, alongside imperial competition and settler colonization in various regions.

The early 20th century brought transformative upheaval. World War I (1914–1918) redrew national borders, shifted power, and contributed to social and political upheaval at home. The Russian Revolution of 1917 produced the first large-scale socialist state and influenced political movements worldwide. The interwar period featured economic volatility, including the Great Depression, and the rise of new political ideologies in several countries. Innovations in science, technology, and culture continued to accelerate during this era, influencing daily life, communication, and industry.

World War II began in 1939 and expanded into a global conflict by 1941, altering international alliances, economies, and postwar planning. The early 1940s also saw continued colonial dynamics and resistance movements in various territories. Across 1865–1941, advances in electricity, transportation, medicine, and media, together with shifts in governance and social norms, laid the groundwork for many aspects of the modern world. The period ends as the world moves from interwar realignment toward the wartime and postwar order that would define the mid-20th century.