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Staples has become the second major chain to announce the mass closing of stores this week, providing the latest evidence of how the retail landscape is being remade by shifts in American shopping habits.

The nation’s largest office-supply company said Thursday that nearly half of its sales are now generated online, and it is working aggressively to cut costs and become more efficient. It aims to close more than 10 percent of its North American stores by the end of next year, up to 225 stores, as part of a plan to save about $500 million.

Staples Chairman and CEO Ron Sargent said his company’s stores have fallen short of expectations over the past three years, and the company launched a plan last year to “fundamentally reinvent” Staples. “This is essential,” he told analysts. “Our customers are using less office supplies, shopping less often in our stores and more online, and the focus on value has made the marketplace even more competitive.”

Two days ago, RadioShack, which is fighting to update its image, announced plans to close up to 1,100 stores, about a fifth of its U.S. locations, after its losses widened during a dismal holiday season.

The recession did heavy damage to chains like Staples, and competition from discount stores also hurts. But online sales are affecting brick-and-mortar stores across the retail sector, no matter if the company is selling clothes, books or electronics.

Shoppers are buying online more, and they’re also window shopping virtually, so they are making fewer store visits, said Bill Martin, co-founder of ShopperTrak, which tracks data at about 40,000 U.S. stores. He said that’s part of the reason the number of stores is contracting even though overall sales are growing, albeit at a slower pace. “I think it’s pretty clear that the consumer is evolving and might be evolving at a little faster pace than retail.”