The focus on selling indulgences became so important because when the Renaissance period came, the church was losing its power, so people were able to freely buy things they wanted, even if they didn't needed them, and to not fear about being charged, beaten up, or even end up dead just because the church didn't thought its appropriate. Also, a very big factor was the fact that the people in this period, in general, had more money than the people in the Middle Ages, so the increased financial power enabled them to buy things that they found interesting but were not necessities.
The revolution in Haiti took place when a large portion of the islands slave population rose against their colonial masters. Many Americans were concerned that the revolt would inspire slaves in the US to do the same thing.
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The Holy Qur'an was revealed during the Month of Ramadan to Prophet Muhammad (S.A.W) in cave Hira by Angel Jibril
Napoleon's Continental System was designed to destroy the British economy completely by blocking any trades from allies to Britain and even the neutral countries. Britian counter blocked and resulted in the Anglo-American War of 1812.
One way in which the Kingdom of Ghana facilitated the gold trade was by trading gold with slaves and other workers. Most of the trading was done with other African nations but some with Europeans.