Hussein, a constitutional monarch, started his rule with what was termed a "liberal experiment," allowing, in 1956, the formation of the only democratically elected government in Jordan's history. A few months into the experiment, he forced that government to resign, declaring martial law and banning political parties. Jordan fought three wars with Israel under Hussein, including the 1967 Six-Day War, which ended in Jordan's loss of the West Bank. In 1970 Hussein expelled Palestinian fighters (fedayeen) from Jordan after they had threatened the country's security in what became known as Black September. The King renounced Jordan's ties to the West Bank in 1988 after the Palestine Liberation Organization was recognized internationally as the sole representative of the Palestinians. He lifted martial law and reintroduced elections in 1989 when riots over price hikes spread in southern Jordan. In 1994 he became the second Arab head of state to sign a peace treaty with Israel.