In 1998, Guterres presided over Expo 98 in Lisbon, commemorating the 500th anniversary of the voyage of Vasco da Gama. Also in 1998, two nationwide referenda were held. The first one was held in June and asked voters whether abortion rules should be liberalized. The Socialist Party split over the issue of liberalization, and Guterres led the pro-life side, which eventually won the referendum. A second referendum was held in November, this time over the regionalization of the mainland. Both Guterres and his party supported such an administrative reform, but the voters rejected it.