Imperialist expansion refers to the process by which a nation extends its power and influence over other territories through colonization, military conquest, or economic dominance. This phenomenon became particularly prominent during the late 19th and early 20th centuries, as various nations sought to acquire new lands to bolster their economies and assert their global status. In the aftermath of World War I, unresolved tensions fueled by imperialist ambitions contributed to geopolitical rivalries, economic instability, and the redrawing of national boundaries.