Wal-Mart plans to open most of its stores at midnight the day after U.S. Thanksgiving, becoming the latest in a series of retailers to expand hours to lure in American shop­pers who want to get a head-start on holiday bargain shopping.

The world’s largest retailer said yesterday it is also offering shoppers a sneak preview of the discounts it has planned, from laptops to jeans.

The day after Thanksgiving, known as Black Friday, is one of the busiest shopping days of the year in the U.S., known for its deep discounts that bring many Canadians south of the border for their own holiday shopping.

Sears Holdings Corp., which operates Kmart, Sears, Roebuck and Co., said recently that its Sears Roebuck stores will be opening on Thanksgiving Day for the first time in its history. Toys R Us announced last week it will open its stores at 10 p.m. Thanksgiving Day.

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