As far as I am concerned Gao was not one of the Songhay Empire's major ones but I bet two answers should be acceptable in this question. I also think that you can include the third option from the scale represented above because <span>Algiers were quite far away on north so they couldn't be the part of the Songhay. </span>
Answer:
The Union was able to stop Confederate supplies coming from Florida
Explanation:
During the Civil War, Florida whose population was largely made up of slave workers was unable to contribute much man power to the millitary (only about 15,000 men), but was able to contribute provisional goods to the Confederate army. When attention of the north was called to this by fleeing slaves and defecting Confederate soldiers, a blockade was imposed to prevent the supply of provisional goods from Florida by the Union army.
The majority of American intervention in the foreign affairs occurred during the Cold War (this is your answer). Latin America was a frequent hotspot for activity as well especially towards the latter half of the Cold War with Fidel Castro's rise to power in Cuba.