Dow Jones industrial average breaks through 20,000 milestone

The Dow Jones industrial average crossed the 20,000 mark for the first time Wednesday, the latest milestone in a record-setting drive for the stock market.

Strong earnings from Boeing and other big companies helped push the Dow past the threshold early on. U.S. stocks closed solidly higher, lifting the Standard & Poor’s 500 index and Nasdaq composite to record highs of their own for the second day...