 Neighbouring Saudi Arabia opposed this development and actively supported North Yemen's rural tribes, pitting large parts of the country against the urban and largely pro-republican inhabitants of Sanaa. The North Yemen Civil War resulted in the destruction of some parts of the city's ancient heritage and continued until 1968 when a deal between the republicans and the royalists was reached, establishing a presidential system. Instability in Sanaa continued due to continuing coups and political assassinations until the situation in the country stabilized in the late 1970s.