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A new national divide is emerging among states over whether to track sales by gun stores. A California law taking effect Monday will require credit card networks to provide banks with special retail codes to assign to gun stores. Advocates hope it will help flag suspicious purchases and avert mass shootings.

Rising home values have led to higher real estate taxes around the U.S. Now many states are looking to provide relief to frustrated residents. New laws enacted in Alabama, Colorado and Wyoming will limit the growth in tax-assessed values for homeowners. Proposals to curb property taxes also will appear on ballots this year in Colorado and Georgia.