Nebraska constitution
Article XIII: state, county, and municipal indebtedness
Section 2

Notwithstanding any other provision in the Constitution, the Legislature may also authorize any incorporated city or village, including cities operating under home rule charters, to appropriate from local sources of revenue such funds as may be deemed necessary for an economic or industrial development project or program subject to approval by a vote of a majority of the registered voters of such city or village voting upon the question. For purposes of this provision, funds from local sources of revenue shall mean funds raised from general taxes levied by the city or village and shall not include any funds received by the city or village which are derived from state or federal sources.