I believe the answer is the closing of the port.
<span>Some synonyms of sovereign are monarch, leader, ruler, overlord, crowned head and king. Its meaning is a man who has incomparable power or specialist. a gathering or assortment of people or a state having sovereign specialist. a gold coin of the United Kingdom, equivalent to one pound sterling: left flow after 1914.</span>
Ulysses Grant (born 1822- died 1885) commanded the victorious Union army during the American Civil War 1861-1865 and served as the 18th U.S. president from 1869 to 1877. Also he was born in Ohio and fought in the “Mexican-American” War from 1846-1848
The size of the Atlantic slave trade dramatically transformed African societies. The slave trade brought about a negative impact on African societies and led to the long-term impoverishment of West Africa