Cabrillo National Monument commemorates the landing of the navigator who explored North America for what country?
Cabrillo National Monument:  It commemorates the landing of Juan Rodríguez Cabrillo at San Diego Bay on September 28, 1542. Juan Rodríguez Cabrillo: Juan Rodríguez Cabrillo, also known as João Rodrigues Cabrilho (born 1499, died January 3, 1543), was a navigator and explorer, known for exploring the West Coast of North America on behalf of the Spanish Empire.
Spanish Empire