6. The Arab Spring, 2010
An umbrella term for a series of protests that broke out in much of the Arab world, the Arab Spring began in the early 2010s as a response against the oppressions faced by Tunisian, Egyptian, Yemeni, Syrian and Bahraini people from their respective regimes and a low standard of living.
The events saw either the deposition of the existing rulers or rise in insurgencies, which were met with equal retaliation from authorities in power.
As a result, several large-scale conflicts broke out, including the rise of the Islamic State, the Syrian Civil War, etc. Unfortunately, the idealistic hope that these uprisings would end corruption and establish economic equality was squashed due to these unresolved conflicts that continue even today.