and therefore large urban areas usually extend over several municipalities which form one single conurbation. Although an urban area might cover an entire municipality, auxiliary councils might still be used for administrative purposes. Municipalities are responsible for public services (such as water and sewerage), street lighting, public safety, traffic, supervision of slaughterhouses and the cleaning and maintenance of public parks, gardens and cemeteries. They may also assist the state and federal governments in education, emergency fire and medical services, environmental protection and maintenance of monuments and historical landmarks. Since 1983, they can collect property taxes and user fees, although more funds are obtained from the state and federal governments than from their own collection efforts. Some municipalities in Mexico are subdivided into internal, third-level administrative organizations. All municipalities of Baja California are subdivided into boroughs, or delegaciones. Mexicali municipality, for example, is divided into 14 boroughs besides the City of Mexicali, which comprises the municipal seat and three additional metropolitan boroughs. Querétaro municipality is subdivided into seven boroughs. Nonetheless, the heads of government of the boroughs are not elected by the residents but rather appointed by the municipal president. Mexico City is a special case in that it is not organized into municipalities. As a result of the Political Reforms enacted in 2016, it is no longer designated as a Federal District and became a city, a member entity of the Mexican federation, seat of the Powers of the Union and the capital of Mexico. Mexico City is divided in 16 boroughs, officially called demarcaciones territoriales, substituting the old delegaciones. The boroughs are considered as third-level territorial divisions for statistical data collection and cross-country comparisons. History Since the Conquest and colonization of Mexico, the municipality became the basic entity of the administrative organization of New Spain and the Spanish Empire. Settlements located in strategic locations received the status of ciudad (the highest status within the Empire, superior to that of villas and pueblos) and were entitled to form an ayuntamiento or municipality. During the first decades, the local authorities had full powers on the public and economic administration of each municipality, but successive reforms diminished their attributions. After Independence, the 1824 Constitution did not specify any regulation for the municipalities, whose structure and responsibilities were to be outlined in the constitution of each state of the federation. As such, every state set its own requirements for a settlement to become