(msn) More than 1% of all households slipped into foreclosure in 2007, as more borrowers failed to keep up on their mortgages. Nevada led the nation with the highest foreclosure rate, while California had the highest total number of foreclosures. U.S. foreclosures jumped 75% in 2007 to more than 2.2 million filings. The end of the year saw an acceleration in the rate of foreclosure activity, which was up 7% in December from the previous month and 97% from the previous year, according to the data firm RealtyTrac. December was the fifth straight month to have more than 200,000 filings, erasing any hopes that the surge in foreclosures was slowing. "We really don't see any indication that the rate of activity will come down anytime soon," says Rick Sharga, RealtyTrac vice president.