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Dollar Tree is selling Family Dollar for $1 billion a decade after it bought the North Carolina company for $8 billion.

Two of the biggest dollar stores are merging. Family Dollar shareholders agreed to an $8.7 billion takeover Thursday, choosing not to accept a bigger offer from Dollar General due to antitrust fears.

North Carolina-based Family Dollar was opening hundreds of stores a year, until this year. Now it’s being bought by Dollar Tree, one of its biggest…