Which nation started the Arab Spring and what caused it?

Context: The Arab Spring was a series of anti-government protests, uprisings and armed rebellions that spread across much of the Arab world in the early 2010s. It began in Tunisia in response to corruption and economic stagnation. From Tunisia, the protests then spread to five other countries: Libya, Egypt, Yemen, Syria and Bahrain. Rulers were deposed or major uprisings and social violence occurred including riots, civil wars, or insurgencies. Sustained street demonstrations took place in Morocco, Iraq, Algeria, Lebanon, Jordan, Kuwait, Oman and Sudan. Minor protests took place in Djibouti, Mauritania, Palestine, Saudi Arabia and the Moroccan-occupied Western Sahara. A major slogan of the demonstrators in the Arab world is ash-shaʻb yurīd isqāṭ an-niẓām!.

Answer: The Arab Spring began in Tunisia in response to corruption and economic stagnation. From Tunisia, the protests then spread to five other countries: Libya, Egypt, Yemen, Syria and Bahrain.