What passage allowed groups of nomadic peoples to travel into northwestern india?

Explanation:Du Bois, W. E. B. (23 February 1868–27 August 1963), African-American activist, historian, and sociologist, was born William Edward Burghardt Du Bois in Great Barrington, Massachusetts, the son of Mary Silvina Burghardt, a domestic worker, and Alfred Du Bois, a barber and itinerant laborer. In later life Du Bois made a close study of his family origins, weaving them rhetorically and conceptually—if not always accurately—into almost everything he wrote. Born in Haiti and descended from Bahamian mulatto slaves, Alfred Du Bois enlisted during the Civil War as a private in a New York regiment of the Union army but appears to have deserted shortly afterward. He also deserted the family less than two years after his son’s birth, leaving him to be reared by his mother and the extended Burghardt kin. Long resident in New England, the Burghardts descended from a freedman of Dutch slave origin who had fought briefly in the American Revolution. Under the care of his mother and her relatives, young Will Du Bois spent his entire childhood in that small western Massachusetts town, where probably fewer than two-score of the 4,000 inhabitants were African American. He received a classical, college preparatory education in Great Barrington’s racially integrated high school, from whence, in June 1884, he became the first African-American graduate. A precocious youth, Du Bois not only excelled in his high school studies but contributed numerous articles to two regional newspapers, the Springfield Republican and the black-owned New York Globe, then edited by T. Thomas Fortune.