Question: The Penn Center provided critical educational facilities to Gullah slaves, who are are the descendants of enslaved Africans in what US states?

<P0-S0> The Mechanic Institute is a historic educational building at 44-56 Congress Street in downtown Rumford, Maine. <P0-S1>  This handsome four-story brick building was built in 1910 by the Rumford Falls Power Company to provide educational facilities for its workers and their children. <P0-S2>  It is now owned by the city, and the former educational facilities have been repurposed into a community center. <P0-S3>  The building was listed on the National Register of Historic Places in 1980. <SEP> <P1-S0> The Gullah are the descendants of enslaved Africans from various people who lived in the Lowcountry regions of the U.S. states of Georgia and South Carolina, in the area of both the coastal plain and the Sea Islands. <P1-S1>  They developed a creole ethnicity and language that is distinctive among African Americans. <SEP> <P2-S0>  Founded in 1862 by missionaries from Pennsylvania, it was the first school founded in the Southern United States specifically for the education of African-Americans. <P2-S1> The Penn Center, formerly the Penn School, is an African-American cultural and educational center near Frogmore, South Carolina, on Saint Helena Island. <P2-S2>  It provided critical educational facilities to Gullah slaves freed after plantation owners fled the island, and continues to fulfill an educational mission. <P2-S3>  The campus was designated a National Historic Landmark District in 1974. <P2-S4>  Darrah Hall and Brick Baptist Church on the campus were declared part of Reconstruction Era National Monument in January 2017. <SEP> <P3-S0> Black Caribs are indigenous people from the island of St. Vincent, formed by the mixture between Island Caribs and enslaved Africans produced in the 18th century. <P3-S1>  This population retains Caribbean culture and makes up a very small population in the archipelago, representing the 2.0% of the current population of St. Vincent and Grenadines. <P3-S2>  There are also black Caribs in Dominica and Trinidad. <P3-S3>  The history of the Black Caribs is known thanks to reports that the British governor William Young sent to the British crown, in which he explained that the Black Caribs were a mix of Caribs and enslaved Africans from Spanish ships wrecked near its shores. <P3-S4>  These reports were read and taken as reference by many chroniclers and later historians. <P3-S5>  However, researchers of history and Garifuna language (the Garifunas are descendants of Black Caribs in the mainland of Central America) of the 20th and 21st centuries, such as Itarala, have their own conception of the origin of the Black Caribs. <P3-S6>  According to them, the African ancestors of the Black Caribs come from other Caribbean islands and migrated to Saint Vincent as refugees to escape slavery and as slaves bought by the Carib Amerindians. <P3-S7>  The Black Caribs are the people who originated the Garifuna people, when part of their community was expelled from St. Vincent in 1797 and exported to the island of Roatán, Honduras, from where they migrated to the coast of the mainland of Central America, spread as far as Belize and Nicaragua.