Upon the withdrawal of the Spanish occupation of the Western Sahara in 1975, Hassan II used the opportunity to publicly galvanize nationalist sentiment by pressing Morocco's claims to the territory, over the objections of the local Sahrawi people and of the Algerian and Mauritanian governments. He organized the Green March, which saw around 350,000 Moroccans crossing the southern border to settle inside the territory, triggering a war with the Polisario, the armed front of the Sahrawi people. A ceasefire was negotiated in 1989, but the conflict remains unresolved today, with most of the territory under de facto Moroccan control while the Sahrawi Arab Democratic Republic controls the easternmost zones. During the 1990s Hassan II change course in domestic politics and publicly promoted an agenda of reform. A new constitutional reform, approved by referendum, was enacted in 1993. Another amendment to the constitution was passed in 1996 to create a bi-cameral legislature, with the lower house elected directly by voters and an upper house chosen indirectly by regional assemblies and professional organizations.