GOREE ISLAND, Senegal (AP) — U.S. Treasury Secretary Janet Yellen paid a solemn visit Saturday to the salmon-colored house on an island off Senegal that is one of the most recognized symbols of the horrors of the Atlantic slave trade that trapped tens of millions of Africans in bondage for generations. Yellen, in Senegal as part of a 10-day trip aimed at rebuilding economic relationships between the U.S. and Africa, stood in the Gorée Island building known as the House of Slaves and peered out of the Door of No Return, from which enslaved people were shipped across the Atlantic. “Gorée and the trans-Atlantic slave trade are not just a part of African history.