Wall Street rose on Thursday, and the Dow Jones Industrial Average touched a record high, as easing oil prices and hopes for progress toward ending the Iran war pulled buyers into healthcare and financial shares. The Dow rose 809.88 points, or 1.60%, to 51,496.83, the S&P 500 gained 39.74 points, or 0.53%, to 7,593.42, and the Nasdaq Composite added 60.69 points, or 0.23%, to 26,915.12; Oliver Pursche, senior vice president at Wealthspire Advisors, called the chip move “rational exuberance” after Broadcom fell while Nvidia and Taiwan Semiconductor rose.