The economic and technological rivalry between the U.S. and China has come to the drone market, where Chinese-made flying devices are a dominant player in America. Lawmakers in Washington are seeking to ban new sales of Chinese-made drones, arguing they could be used to spy on Americans and that the low-cost models are hurting the U.S. drone industry. But U.S. users — spanning from police officers to farmers to mappers and filmmakers — have come to rely on Chinese-made drones, especially those by DJI Technology, for their work or lives. Florida has banned Chinese drones in state-funded programs, but also appropriated $25 million to help offset replacement costs.