EstablishmentLegally, the National Development Party was the successor of the :th:พรรคปวงชนชาวไทย (พ.ศ. 2525), Thai People's Party established by General Arthit Kamlang-ek in 1982. By 1992, it was only an empty shell, as General Arthit and all notable members had abandoned it. Shortly ahead of the September 1992 Thai general election, elections in September 1992, Chatichai Choonhavan, who had been prime minister until the military coup d'état in 1991, and a group of other Thai Nation Party politicians around Chatichai's nephew Korn Dabbaransi took over the party and renamed it. The establishment followed a rupture in the Thai Nation Party, whose leadership around :th:สมบุญ ระหงษ์, Somboon Rahong and secretary general Banharn Silpa-archa had stood at the side of the military junta (National Peace Keeping Council, NPKC) during the popular protests and bloody crackdown of Black May (1992), Black May. Therefore, the Thai Nation Party was considered one of the "devil parties". A faction of Thai Nation deputies around Chatichai's cousin Korn Dabbaransi felt uncomfortable with this policy and persuaded Chatichai to leave the party. The new party was set up as a vehicle to support a second premiership for Chatichai. They were joined by members of the likewise military-allied Justice Unity Party who now wanted to disassociate themselves from the junta. They included General Arthit Kamlang-ek (who thus returned to his original party), Somchai Khunpluem ("Kamnan Poh", or the "Godfather of Chonburi Province, Chonburi") and Suwat Liptapanlop, an entrepreneur from Nakhon Ratchasima Province, Nakhon Ratchasima. Moreover, the party could win over Democrat Party (Thailand), Democrat Party secretary general :th:ประจวบ ไชยสาส์น, Prachuab Chaisarn. Chatichai stressed the fact that his party had nothing to do with the military junta and the Black May events. He presented it as a new party which consisted mainly of younger lawmakers, espoused democracy and took a neutral position in the polarised political spectrum. The party succeeded in winning financially strong sponsors and win over politicians from other parties. In the September 1992 election, the party won 60 seats and thus become the third strongest force countrywide. It joined the government coalition led by Chuan Leekpai but left it again after less than a year.
Thaksin governmentIn December 2001, the National Development Party, which had been the largest opposition party, joined the coalition government of Prime Minister Thaksin Shinawatra. Thaksin dropped the party from the coalition in November 2003. Therefore, several politicians left the National Development Party to join Thaksin's Thai Rak Thai Party Thaksin exerted further pressure and before the 2005 Thai general election, 2005 election, the party had merged into the Thai Rak Thai Party. After the 2006 Thai coup d'état, 2006 coup d'état, the Constitutional Court of Thailand, Constitutional Tribunal dissolved the Thai Rak Thai Party in May 2007, and in September the National Development Group merged with Thais United to form the Ruam Jai Thai Chart Pattana Party.
Leaders* Chatichai Choonhavan (1992-1998) * Korn Dabbaransi (1998-2003) * Suwat Liptapanlop (2003-2005)