I would say to show that your source is credible!
Good Day!
Although there are no options attached, we can comment on the following.
One way in which African states or societies changed as a result of the spread of Islam in the period circa 1200 to 1450 was the way the culture had to adapt to Muslim customs. Let's set the example of the Mali Empire.
The Mali Empire started in 1240 and ended in 1645 CE. It was Sundiata who decided to centralize the government, developed a great army and established the presence of Islam in the Empire, which intermingled with previous African religious beliefs. It was Mansa Musa who took the empire to new levels of development, controlling the trade routes of the time and increasing the power and presence of the Mali Empire.
The correct answer is either manifest destiny or the civil war
Because of the civil war and the expenses of maintaining a navy that could blockade Confederate ports, the Navy was constantly losing power and ships and after the war ended most of the 700 initial ships were completely out of service. As manifest destiny and reconstruction began spreading, the government did not focus on rebuilding its navy and a large part of the navy that remained had to focus on things like helping merchants or doing civilian runs in order to be sustained.
I think it's Ghana Empire Wagadou