Moody's is scheduled to publish its latest review of Spain's credit rating tomorrow.
In late afternoon trading in New York, the Dow Jones Industrial Average rose 0.73 per cent, the Standard & Poor's 500 gained 1.05 per cent, while the Nasdaq Composite Index advanced 1.37 per cent.
Europe's Stoxx 600 Index finished the day with a 0.3 per cent increase from the previous close.
Meanwhile, hopes are pinned on an economic boost from China, the world's second-largest economy.
"The possibility of more Chinese stimulus is real," Peter Jankovskis, who helps manage more than US$3 billion at Oakbrook Investments in Lisle, Illinois, told Bloomberg News. "That does provide some hope to the market."
It also provided support to commodities with oil, gold, silver and copper all advancing today.
The optimism on Europe and China tempered demand for the US Treasury's auction of US$29 billion of seven-year notes. The sale's bid-to-cover ratio was 2.61, the lowest in 11 months and below the 2.82 average for the past 10 auctions, according to Bloomberg.
Even so, the latest reports on the American economy were less than stellar. US gross domestic product expanded 1.3 per cent in the second quarter, which was less than previously estimated.
And durable goods orders sank 13.2 per cent in August, according to Commerce Department data. That was the steepest plunge since January 2009, and far exceeded the 5 per cent decline predicted by economists polled by Reuters.
A bright spot was provided by weekly unemployment claims. Applications for jobless benefits fell 26,000 to 359,000 in the week ended September 22, according to Labor Department data.