Gompers, who had ties with the Cuban cigar workers in the U.S., called for American intervention in Cuba; he supported the resulting war with Spain in 1898. After the war, however, he joined the Anti-Imperialist League to oppose President William McKinley's plan to annex the Philippines. Mandel (1963) argues that his anti-imperialism was based on opportunistic fears of threats to labor's status from low-paid offshore workers and was founded on a sense of racial superiority to the peoples of the Philippines.