Dow tops 20,000 mark after month-long tease

The Dow Jones industrial average crossed the 20,000 mark for the first time, with the blue-chip index reaching that threshold after hovering just south of it for more than a month.
The index crossed the line at the opening bell, following new record highs Tuesday for the S&P 500 and the Nasdaq Composite index. Before trading opened Wednesday, Dow futures contracts indicated that it was likely to hit the mark at the outset.
It remains to be seen whether the Dow will stay above 20,000 at the c