Here's a look at what you need to know about the Arab Spring, anti-government protests that began in Tunisia in December 2010 and spread quickly throughout the Middle East and Africa in 2011.
Algeria: January-February 2011 - Sporadic demonstrations and self-immolations in opposition to the government occur.
February 12, 2011 - Riot police outnumber anti-government protesters in Algiers and quickly disperse the demonstration.
February 22, 2011 - The Algerian government announces an end to the state of emergency imposed in 1992. However, protest marches in Algiers are still banned.
Bahrain: February 2011 - Anti-government demonstrations break out, quickly becoming violent as security forces and protesters clash.
February 15, 2011 - Thousands of demonstrators gain control of the Pearl Square roundabout in Manama.
February 17, 2011 - In the early morning hours, riot police move into the Pearl Square area and violently disperse the crowd. Several people are killed.
February 19, 2011 - On the order of the government, security forces withdraw from the Pearl Square. Protestors retake the area.
February 22, 2011 - Protests continue as Crown Prince Salman bin Hamad al-Khalifa appeals for a national dialogue.
February 26, 2011 - Opposition leader Hassan Mushaimaa returns from exile.
March 14, 2011 - Saudi Arabia and the United Arab Emirates send several hundred troops to Bahrain under the banner of the Gulf Cooperation Council. The troops are in the country at the request of King Hamad.
March 15, 2011 - A three-month state of emergency goes into effect.
March 16, 2011 - Security forces crackdown on protesters in Manama, killing at least six people.
March 18, 2011 - The Pearl Roundabout in Manama is demolished.
March 20, 2011 - King Hamad states that his government has foiled a 20-30 year plot by an unnamed country to destabilize Bahrain.
March 25, 2011 - Protests take place in residential areas outside Manama.
April 25, 2011 - The government of Bahrain sends a confidential report to the United Nations, claiming that Hezbollah is plotting to overthrow the country's monarchy.
June 1, 2011 - Bahrain lifts the emergency laws imposed on March 15.
June 6, 2011 - The trial of 47 doctors and nurses, accused of trying to overthrow the government, begins in Manama.
August 8, 2011 - Bahrain releases 140 political detainees, including two former members of Parliament.
September 1, 2011 - Thousands of demonstrators take to the streets to protest the death of 14-year-old, allegedly killed by riot police, the day before.
September 17, 2011 - Tens of thousands of people protest against the government, following the funeral of a man who died in questionable circumstances. He allegedly died following a tear gas attack on his father's home. The government maintains he died of sickle cell anemia.
September 29, 2011 - 20 doctors are convicted of trying to overthrow the government and are sentenced to prison terms ranging from five to 15 years.
November 23, 2011 - An independent commission set up by King Hamad al-Khalifa concludes that Bahrain's police used excessive force and torture against civilians in the crackdown against protesters.
Egypt: January 25, 2011 - Anti-government protests erupt in Egypt. Several thousand demonstrators take over Tahrir Square in Cairo.