The term is a modern compound adjective formed in the late 20th century within the context of international politics and military interventions. It combines the initialism 'US', representing the United States, with the past participle 'led' from the Old English verb 'lǣdan', meaning "to guide or conduct." This construction follows a common English pattern for creating compound adjectives that describe the agent of an action (e.g., state-sponsored, teacher-led). The term's logic is transparently descriptive, specifying that the planning, command, or predominant influence in an endeavor originates from the United States, reflecting its geopolitical role in the post-World War II era.

Structure: US (United States) + led (led) - US: An initialism (English). Functions as a noun modifier indicating the agent or source. - led: Past tense and past participle of the verb 'lead' (Old English). Functions as a participial adjective indicating the state of being guided or directed.