Equities advanced amid expectations that policymakers are gearing up to bail out Spain in an effort to help curtail the impact of Europe's debt crisis on the pace of global growth.
In late afternoon trading in New York, the Dow Jones Industrial Average climbed 1.83 per cent, the Standard & Poor's 500 Index rose 1.65 per cent and the Nasdaq Composite Index gained 1.84 per cent.
Underpinning the positive sentiment was the Federal Reserve's assessment of the world's largest economy, pointing to a moderate pace of growth.
"Reports from the twelve Federal Reserve Districts suggest overall economic activity expanded at a moderate pace during the reporting period from early April to late May," the Fed said in its latest Beige Book survey of business conditions. "Economic outlooks remain positive, but contacts were slightly more guarded in their optimism."
That's an improvement from the April survey in which the Fed said the US economy had grown at a "modest to moderate" pace.