Wall Street rallies on trade optimism

All three major U.S. indexes ended the session higher, and for the fourth straight session, the S&P 500 held above its 200-day moving average, a key technical level.Talks between the United States and China will resume in Washington next week, with both sides saying progress has been made toward resolving the two countries' contentious trade dispute.Tariff-vulnerable industrials provided the biggest lift to the blue-chip Dow, led by bellwethers Boeing Co, 3M Co, United Technologies Inc and C