I believe the answer is 4. During the reign of Askia Muhammad, the Songhai empire reached its greatest size.
Askia Muhammad was an emperor, military commander, and political reformer of the Songhai Empire in the 15th century. His rule resulted in trade with Europe and Asia, building of lots of schools, and spread of Islam through his empire.
Hope this helps! Please let me know if I'm wrong :)
Russia in 2014 Crimean war and in the first Crimean war (1854-1856)
They were required to work for the government one month per year.
Its considered one of the most important achievements of thomas jeffresons presidency.
