 Following the collapse of the ruling Communist League, Croatia adopted a new constitution in 1990 – which replaced the 1974 constitution adopted by the Socialist Republic of Croatia – and organised its first multi-party elections.While the 1990 constitution remains in force, it has been amended four times since its adoption—in 1997, 2000, 2001 and 2010.Croatia declared independence from Yugoslavia on 8 October 1991, which led to the breakup of Yugoslavia.