The newly independent state, inspired by the idea of creating a 'Greater Morocco', claimed all of Spanish West Africa as Moroccan land.[4] In 1958 Spain merged Rio de Oro and Saguia el-Hamara in 1958 as Spanish Sahara;[2] that same year Spain ceded the Tarfaya Strip to Morocco (via the Treaty of Angra de Cintra), thereby re-instating the 1904 border.[3][2][5] Ifni was ceded in 1969 (following a failed Moroccan attempt to capture the region by force in 1957).[2][6] Morocco then turned its sights to Spanish Sahara, however Mauritania (independent since 1960) also contested the territory, claiming the former colony of Rio de Oro as part of 'Greater Mauritania'.[2] Saharawi nationalists had meanwhile formed the Polisario, seeking independence for the whole of Spanish Sahara as Western Sahara, and began a low-level guerrilla campaign.