I am looking for a book whose title roughly translates to "Way to Oregon". The author was a person of color, probably an African-American.
The story is about a group who were involved in trade when Europeans first arrived in America. There was frequent killing of bison and native Americans to clear land for new settlements.
The book was published at least before 1965. It was a thick hardcover book. The writer shared his first-hand experience of travelling from the east coast to the west coast. At that time, slavery was still in place in some of the states but written off in some states on the east coast.
The book was a Bengali version translated from English. The Bengali title was "Oregon er Pothe". I do not remember the genre, though.