After World War II, Australia encouraged immigration from mainland Europe. Since the 1970s and following the abolition of the White Australia policy, immigration from Asia and elsewhere was also promoted. As a result, Australia's demography, culture, and self-image were transformed. The ''Australia Act 1986'' severed the remaining constitutional ties between Australia and the United Kingdom. In a 1999 referendum, 55% of voters and a majority in every state rejected a proposal to become a republic with a president appointed by a two-thirds vote in both Houses of the Australian Parliament. There has been an increasing focus in foreign policy on ties with other Pacific Rim nations while maintaining close ties with Australia's traditional allies and trading partners.