U.S. holiday sales growth slowed by more than half this year after gridlock in Washington soured consumers' moods and Hurricane Sandy disrupted shopping, MasterCard Advisors SpendingPulse said.

Retail sales grew by 0.7 percent from Oct. 28 through Dec. 24, the Purchase, New York, research firm said yesterday, without providing a dollar figure in the billions. Sales grew at a 2 percent pace in the same period a year ago. SpendingPulse tracks total U.S. sales at stores and online via all payment forms.

Americans became skittish as Washington approached the end of the year without an agreement to forestall higher taxes and automatic spending cuts — the so-called fiscal cliff. Hurricane Sandy interrupted shopping in stores and online after it slammed into the East Coast in late October. Last month, retailers from Macy's Inc. to Target Corp. posted same-store sales that trailed analysts' estimates.