[1/4] U.S. Vice President Kamala Harris talks to her Tanzanian counterpart Philip Mpango as she arrives in Tanzania, the second stop of a three-nation tour of Africa, at the Julius Nyerere Airport in Dar es Salaam, Tanzania March 29, 2023. REUTERS/Emmanuel Herman/Pool DAR ES SALAAM, March 30 (Reuters) - U.S. Vice President Kamala Harris announced plans to boost trade with and investment in Tanzania during a visit there on Thursday, part of an African tour aimed at strengthening ties with a continent where China and Russia increasingly hold sway. Harris started her trip on Sunday in Ghana before flying late...