Stock market today: S&P 500 crosses 6,800 mark, joining Dow, Nasdaq in fresh records as US-China trade deal hopes run high Yahoo FinanceWall St scales fresh highs on tech earnings, US-China trade optimism ReutersGlobal Markets Rise Ahead of Trump, Xi Talks The Wall Street JournalGlobal stocks rally as investors are upbeat on U.S.-China trade pact prospects CNBC