After reunification in 1975, the newly reunified Vietnam faced many difficulties including internal repression and isolation from the international community due to the Cold War, Vietnamese invasion of Cambodia and an American economic embargo. In 1986, the Communist Party of Vietnam changed its economic policy and began a series of reforms to the private sector and to the economy through what is known as Đổi Mới, a political movement primarily led by Prime Minister Võ Văn Kiệt. During the 6th National Congress of the Communist Party of Vietnam, the country abolished its planned economy system in favor of a market oriented one. Ever since the reforms in the mid-1980s, Vietnam has enjoyed substantial economic growth.