Which of the following is an example of a significant geographical influence on trade in africa around 800 ad? 1.camels transporting goods. 2.cities springing up as distribution centers. 3.the heat and arid conditions of the saharan desert 4.phoenicians establishing seaports.

A geographic influence means it's related to the natural environment of one place. Around 800 AD, trade was considerably influenced by the heat and arid conditions of the Sahara Desert, this is why Trans-Saharan trade routes had to adapt to these conditions and, for example, thanks to strategies like the use of the camels, powerful empires like the Songhai empire rose and expanded.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

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