Since Madagascar gained independence from France in 1960, the island's political transitions have been marked by numerous popular protests, several disputed elections, an impeachment, two military coups and one assassination. The island's recurrent political crises are often prolonged, with detrimental effects on the local economy, international relations and Malagasy living standards. The eight-month standoff between incumbent Ratsiraka and challenger Marc Ravalomanana following the 2001 presidential elections cost Madagascar millions of dollars in lost tourism and trade revenue as well as damage to infrastructure, such as bombed bridges and buildings damaged by arson. A series of protests led by Andry Rajoelina against Ravalomanana in early 2009 became violent, with more than 170 people killed. Modern politics in Madagascar are colored by the history of Merina subjugation of coastal communities under their rule in the 19th century. The consequent tension between the highland and coastal populations has periodically flared up into isolated events of violence.