On May 25, 1948, a former United States Army flier entered the American Embassy in Paris, renounced his American citizenship and, as astonished officials looked on, declared himself a citizen of the world.

In the decades that followed, until the end of his long life last week, he remained by choice a stateless man — entering, leaving, being regularly expelled from and frequently arrested in a spate of countries, carrying a passport of his own devising, as the international news media chronicled his every move.

His rationale was simple, his aim immense: if there were no nation-states, he believed, there would be no wars.

Garry Davis, a longtime peace advocate, former Broadway song-and-dance man and self-declared World Citizen No. 1, who is widely regarded as the dean of the One World movement, a quest to erase national boundaries that today has nearly a million adherents worldwide, died on Wednesday in Williston, Vt. He was 91, and though in recent years he had largely ceased his wanderings and settled in South Burlington, Vt., he continued to occupy the singular limbo between citizen and alien that he had cheerfully inhabited for 65 years.