U.S. stocks are adding to their records on Monday as Wall Street nears the finish of a second straight winning month.

The S&P 500 was 0.3% higher in its first trading after completing a stunning rebound from its springtime sell-off of roughly 20%. The Dow Jones Industrial Average was up 218 points, or 0.5%, as of 11:40 a.m. Eastern time, and the Nasdaq composite was 0.3% higher.

Stocks got a boost after Canada said it’s rescinding a planned tax on U.S. technology firms and resuming talks on trade with the United States. On Friday, U.S. President Donald Trump had said he was suspending talks with Canada because of his anger with the tax, which he called “a direct and blatant attack on our country.”

One of the main reasons U.S. stocks came back so quickly from their springtime swoon has been the hope that Trump will reach deals with other countries to lower his stiffly proposed tariffs. Otherwise, the fear is that trade wars could stifle the........

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