Military leaders were not prepared for the trench warfare of world war i, in which:
ANSWER: 4th Choice: opposing forces fought each other from elaborate systems of trenches without much loss or gain of land.
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During the ensuing decades, the abolitionist movement grew in Northern states, and Congress regulated the expansion of slavery as new states were admitted to the Union. Britain banned the importation of African slaves in its colonies in 1807 and abolished slavery in the British Empire in 1833.
The Songhai Empire controlled the production and supply of Salt. This was a very important commodity which was known as white gold at the time.
At its peak the Songhai Empire was the largest and richest Empire in Africa and one of the most powerful in all of the Muslim world.
The cities of Timbuktu and Djenné became importing trading centers and remained one of the most important cities in Africa until the empire's demise.
Apart from salt, the empire grew rich due to its control over vast supplies of Gold, slaves, kola nuts, leather, and dates.
Eventually, the huge riches of the Empire attracted attention from other leaders of the region. In the last 20 years, the kings of Songhai were in constant feud with multinational armies which took a political and economic toll on the Empire.
