Lake Keowee Real Estate News – Lake Keowee homes for sale – Lake Keowee News – Lake Keowee Waterfront property for sale – Lake Keowee Waterfront Real Estate for Rent – A threat to the economy – Foreclosures up; sales falling – By Alan Zibel – WASHINGTON – The revival of the housing market is at risk of collapsing. Home sales are sliding, prices are stalling and foreclosures are rising. And mortgage rates are likely to go up after next week, when the Federal Reserve ends a program that has driven them down…