California and 15 states that want the U.S. Postal Service to electrify its mail delivery vehicles are suing to halt purchases of thousands of gas-powered trucks as the agency modernizes its delivery fleet. Three separate lawsuits, filed Thursday by the states and environmental groups in New York and California, ask judges to order a more thorough environmental review before the Postal Service moves forward with the next-generation delivery vehicle program. Plaintiffs contend that purchases of fossil fuel-powered delivery vehicles will cause environmental harm for decades to come. The lawsuits could further delay the Postal Service's efforts to replace the ubiquitous...