the all three kingdoms in africa had some difficult times, there are some reasons for the rise and fall, they were based on leadership and economic issues. ghana rose as a result of good economy and fell as a result of losing monopoly on profitable trade routes. mali rose as a result of strong military leadership and fell when the empire became too large for a weak king to rule. history repeated itself when the same happened to songhai.
the correct answer is: "planes dropped tons of supplies around the city each day."
the blockade of berlin was the closing of the borders that shared the united kingdom and the united states with the soviet union in occupied german territory, and that developed between june 24, 1948 and may 12, 1949. it was imposed by the soviet union, and affected mainly the western area of berlin, then controlled by the forces of the united states, the united kingdom and france. it was applied in response to the monetary reform imposed by these countries. the first two decided to supply the western part of the city through the three air corridors that were legally required to allow the ussr through its territory. the blockade, which lasted eleven months, was lifted by the soviet union on may 12, 1949.