"If the ruling dynasty was wealthy, it would keep the Mandate of Heaven" is the best answer from the list, but it should be noted this was not always the case.
Perhaps the greatest contribution of Grant and Sherman (Grant being the leader of the Northern forces) was that they knew when not to fight--that is when to hold back--since the North's army greatly outnumbered that of the South.
The first is the best option.
It is true that a lot of cultural aspects of Africa have been lost, most specifically, religion.
If we look at imperialism, its height came after the main period of African slave trade (second answer is false).
The tribal conflicts are still very ripe in Africa, and often they're fueled by the carefulness boundary drawing of countries in Africa- the third answer is false.
More self-rule is also false, if anything, imperialism brought less self-rule
The Hagia Sophia was originally a church, but once conquered, Byzantium was ruled by Islam. The Hagia Sophia reflects the history of Constantinople, starting out as Christian and then once conquered, becoming Muslim. Today, much of the Hagia Sophia represents Islam with copious amounts of Arabic writing on the walls, and several Minarets surrounding it. The Hagia Sophia is one of the most beautiful buildings in the world