It would be the arrival of the "United States" in 1917 that was a turning point in the war (World War I) because it stopped the stalemate on the Western Front, since the US provided essential troops and war supplies.
The answer to your question is parliamentary democracy
Answer:
Songhai
Explanation:
Under the rule of Sonni Ali, the Songhai surpassed the Malian Empire in area, wealth, and power, absorbing vast areas of the Mali Empire and reaching its greatest extent.