Winsor McCay 1899;Wikimedia Commons.

After Philippine annexation in 1898, many Filipino farm workers migrated to the American West coast.  As a result of opposition to this influx, the Tydings-McDuffie Act of 1934 reclassified Filipinos as aliens, and thus no longer allowed unrestricted access to the United States.

While the Act promised independence of the Philippines after a period of ten years, it actually occurred after WWII in 1946.