The completion of today’s midterm elections may begin to stabilize stock-market volatility that has undermined an otherwise white-hot U.S. economy, analysts and investors say.

In the past month, both the S&P 500 and the Nasdaq dropped 5 percent, while the Dow Jones industrial average slid 4 percent, erasing much of the gains made in the indexes since the start of 2018 as President Trump’s tariffs slowed growth and interest rates climbed.

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