CHICAGO — Missouri’s passage of a ballot measure that threatens Kansas City and St. Louis’ long-term collection of a 1% earnings tax could stress both cities’ credits, Moody’s Investors Service warned in its weekly credit outlook released Monday.

More than 69% of Missouri voters approved Proposition A, requiring St. Louis and Kansas City to ask voters next spring to approve the continued collection of the earnings tax. The two cities are the only ones in the state to impose the tax.

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