Piedras Negras, Coahuila

Piedras Negras (), is a city and capital of the municipality of the same name in the state of Coahuila de Zaragoza, Mexico, it is located in the most northeastern part of the state and has a metropolitan population of 245,155 inhabitants and borders with the texan city of Eagle Pass and is connected to it through three international bridges.
History.
It was founded by 34 men who would settle on the western side of the Rio Grande on June 15, 1850 as Nueva Villa de Herrera, due to the establishment of Fort Duncan on the US side. in 1880 coal reserves would be discovered and then a railway would be built between 1881 and 83 and on December 1, 1888 it would be elevated to the rank of city and would be renamed Ciudad Porfirio Díaz although after the fall of Díaz in 1911 it would be renamed to his name original.
It would suffer a flood on April 26, 2004 where 31 people would die, and on April 24, 2007 it would be affected by an F4 Tornado where three people would die while seven people would die in Eagle Pass, and between June 14 and 15, 2013, 10,000 houses would flooded due to the rise of the river, where there would only be one fatality.
Events.
On October 21 of each year, International Nacho Day is celebrated where a three-day Nacho Fest is celebrated in the United States and Mexico since the 90s where in 1940 Ignacio "Nacho" Anaya García invented the nacho at the Victory Club restaurant In this city.
The Annual Bike Fest is also celebrated where for three consecutive days there are concerts, food sales, acrobatic shows, etc. where it ends with a raffle for a new motorcycle.
Natural resources.
This region generates a large amount of the national production of coal, one of the most economically important non-metallic minerals in the state.