La Barredora ("The Sweeper Truck") is a criminal gang based in the Mexican resort city of Acapulco, Guerrero and its surrounding territories.
 The criminal group came into existence during the rapid decentralization of Mexico's drug trafficking organizations and as a split-off group of the Beltrán Leyva Cartel.
 Originally, the Beltrán Leyva cartel operated in the city, but the group no longer has presence in Acapulco.
 After the Mexican military gunned down the top boss of the cartel – Arturo Beltrán Leyva – in December 2009, his brother Héctor Beltrán Leyva took control of one of the factions of the cartel and declared war on Edgar Valdez Villarreal, who had long been the right hand of Arturo.
 Amidst the violence, Valdez Villarreal tried to appoint a successor, but those in Acapulco broke off and formed their own criminal gang: the Independent Cartel of Acapulco.
 Within weeks, however, the group had splittered too, forming a new and rival group known as La Barredora.
 Villarreal Valdez was then captured by the Mexican Federal Police in August 2010, but the violence between the groups for the control of Acapulco continued.
Edgar Valdez Villarreal (born August 11, 1973) also known as La Barbie ("The Barbie"), is a Mexican American suspected drug lord and leader of the Beltrán Leyva Cartel, a criminal group based in Sinaloa.
 He was arrested near Mexico City in August 2010 on charges related to large scale drug trafficking.
On June 5, 1942, the United States Congress declared war upon Bulgaria.
 Bulgaria was neutral during 1939-1941, but on March 1, 1941, Bulgaria signed the Tripartite Pact and officially joined the Axis bloc.
 Following this, the Bulgarian government declared war on the United Kingdom and the United States on December 13, 1941.
 The United States officially declared war on Bulgaria on June 5, 1942.
 The capital of Bulgaria, Sofia, and other Bulgarian cities, were bombed by Allied aircraft in 1943 and 1944.
On December 11, 1941, Italy declared war on the United States in response to that country's declaration of war upon the Empire of Japan following the attack on Pearl Harbor four days earlier.
 Germany also declared war on the U.S. the same day.
 The US immediately responded by declaring war on Germany and Italy, thus thrusting the United States in fighting two major fronts across the Pacific and Atlantic Oceans in World War II.
The Tijuana Cartel (Spanish: "Cártel de Tijuana") or Arellano-Félix Organization (Spanish: "Cártel Arellano Félix - CAF") is a Mexican drug cartel based in Tijuana.
 The cartel once was described as "one of the biggest and most violent criminal groups in Mexico."
 However, since the 2006 Sinaloa Cartel incursion in Baja California and the fall of the Arellano-Félix brothers, the Tijuana Cartel had been reduced to few cells.
 In 2016, the organization has become known as Cartel Tijuana Nueva Generación (New Generation Tijuana Cartel) and has begun to aligin itself under the Jalisco New Generation Cartel, along with Beltrán Leyva Organization (BLO) to create an anti-Sinaloa alliance, in which the Jalisco New Generation Cartel heads, creating a possible powershift in Mexico.
The Juárez Cartel (Spanish: "Cártel de Juárez"), also known as the Vicente Carrillo Fuentes Organization, is a Mexican drug cartel based in Ciudad Juárez, Chihuahua, across the U.S.-Mexico border from El Paso, Texas.
 The cartel is one of several drug trafficking organizations that have been known to decapitate their rivals, mutilate their corpses and dump them in public places to instill fear not only into the general public, but also into local law enforcement and their rivals, the Sinaloa Cartel.
 The Juárez Cartel has an armed wing known as La Línea, a Juarez street gang that usually performs the executions.
 It also uses the Barrio Azteca gang to attack its enemies.
An undeclared war is a military conflict between two or more nations without either side issuing a formal declaration of war.
 The term is sometimes used to include any disagreement or conflict fought about without an official declaration.
 Since the United Nations "police action" in Korea followed the example set by the United Kingdom during the so-called Malaysian Emergency, a number of democratic governments have pursued disciplinary actions and limited warfare by characterizing them as something else, such as a "military action" or "armed response".
 The United States has not formally declared war since World War II.
 Most notably, the United States never officially declared war during its more than decade-long involvement in Vietnam; the Gulf of Tonkin Resolution authorized the escalation of the Vietnam War without a declaration of war.
 Nations such as France, which had extensive colonies in which its military provided order, continued to intervene in their former colonies' affairs as police actions.
The Independent Cartel of Guerrero (Spanish: Cártel Independiente de Acapulco or CIDA) was a criminal gang based in the Mexican resort city of Acapulco, Guerrero and its surrounding territories.
 The criminal group came into existence during the rapid decentralization of Mexico's drug trafficking organizations and as a split-off group of the Beltrán Leyva Cartel.
 Originally, the Beltrán Leyva cartel operated in the city, but the group no longer has presence in Acapulco.
 After the Mexican military gunned down the top boss of the cartel – Arturo Beltrán Leyva – in December 2009, his brother Héctor Beltrán Leyva took control of one of the factions of the cartel and declared war on Edgar Valdez Villarreal, who had long been the right hand of Arturo.
 Amidst the violence, Valdez Villarreal tried to appoint a successor, but those in Acapulco broke off and formed their own criminal gang: the Independent Cartel of Acapulco.
 Within weeks, however, the group had splittered too, forming a new and rival group known as La Barredora.
 Villarreal Valdez was then captured by the Mexican Federal Police in August 2010, but the violence between the groups for the control of Acapulco continued.
Lea Mek (  1975 – December 3, 1993) was a Cambodian refugee living in the United States who was a member of the Asian Boyz street gang.
 On December 3, 1993, Mek was murdered in a gang shooting by the Wah Ching gang, at a pool hall in El Monte, California.
 The murder was caught on camera by four surveillance cameras installed within the hall.
 After the murder, the Asian Boyz declared war on the Wah Ching.
 As a result, it influenced a number of other gang murders and shootings in the LA area, and created a strong feud between both Asian gangs.
 Authorities claim the murder inspired a chain reaction of gang violence which led to ten other murders in the LA area.
Knights Templar—Guard of Michoacán (Spanish: "Los Caballeros Templarios Guardia Michoacana") commonly known as the Knights Templar Cartel (Spanish: "Los Caballeros Templarios") is a Mexican criminal organization composed of remnants of the defunct La Familia Michoacana drug cartel based in the Mexican State of Michoacán.

Question: La Barredora was a gang that declared war on the leader of the cartel based where?
Answer: Sinaloa