The legislature by general or special law may provide for the creation, establishment, maintenance, and operation of hospital districts located wholly in a county with a population of 75,000 or less, according to the most recent federal decennial census, and may authorize the commissioners court to levy a tax on the ad valorem property located in the district for the support and maintenance of the district. A district may not be created or a tax levied unless the creation and tax are approved by a majority of the registered voters who reside in the district. The legislature shall set the maximum tax rate a district may levy. The legislature may provide that the county in which the district is located may issue general obligation bonds for the district and provide other services to the district. The district may provide hospital care, medical care, and other services authorized by the legislature.