Investors soaked up U.S. stocks during the month giving the Dow Jones Industrial Average its best June in 81 years while the S&P notched its best in 64 years.

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The rally, which continued on the final trading day of the month, gave the Dow Jones Industrial Average a 6.9 percent jump, the best since 1938, the S&P 500 added 6.3 percent, the strongest June since 1955 and the Nasdaq rose nearly 7-percent – its best showing since 2000 as tracked by the Dow Jones Market Data Group.

While optimism over a U.S.-China trade deal contributed to the climb, especially as Trump hits the G20 in Osaka Japan this weekend, the Federal Reserve’s pivot on the policy was likely a bigger catalyst.

“Drivers [of the rally] would be a change in the perceived trajectory for monetary policy, coupled with a bit of optimism in renewed negotiations with China,” Stephen Guilfoyle, President at Sarge986 LLC, tells FOX Business.

At the Fed’s June meeting, Chair Jerome Powell signaled an uptick in “uncertainties,” and  Friday, Dallas Federal Reserve Bank President Robert Kaplan confirmed the shift which could result in a rate cut, as early as July.  “The big change has really been in the last eight weeks, and it’s been due to heightened trade tensions and then feeding into that decelerating rates of global growth.  The world is very reliant on trade,” he said during an interview with Maria Bartiromo.

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