Second Spanish Republic in the context of "Causes of World War II"

The Spanish Civil War (Spanish: guerra civil española) was fought from 1936 to 1939 between the Republicans and the Nationalists. Republicans were loyal to the left-leaning Popular Front government of the Second Spanish Republic and included socialists, anarchists, communists, and separatists. The opposing Nationalists who established the Spanish State were an alliance of fascist Falangists, monarchists, conservatives, and traditionalists supported by Nazi Germany and Fascist Italy and led by a military junta among whom General Francisco Franco quickly achieved a preponderant role. Due to the international political climate at the time, the war was variously viewed as class struggle, a religious struggle, or a struggle between dictatorship and republican democracy, between revolution and counterrevolution, or between fascism and communism. The Nationalists won the war, which ended in early 1939, and ruled Spain until Franco's death in November 1975.

The war began after the partial failure of the coup d'état of July 1936 against the Popular Front government by a group of generals of the Spanish Republican Armed Forces. The Nationalist faction consisted of right-wing groups, including Christian traditionalist party CEDA, monarchists, including both the opposing Alfonsists and the religious conservative Carlists, and the Falange Española de las JONS, a fascist political party. However, rebelling units in almost all important cities did not gain control, leaving Spain militarily and politically divided. The rebellion was countered with the help of arming left-wing social movements and parties and formation of militias, what led to rapid socioeconomic and political transformation in the Republican zone, referred to as the Spanish Revolution. The Nationalist forces received munitions, soldiers, and air support from Fascist Italy and Nazi Germany while the Republican side received support from the Soviet Union and Mexico. Other countries, such as the United Kingdom, France, and the United States, continued to recognise the Republican government but followed an official policy of non-intervention. Despite this policy, tens of thousands of citizens from non-interventionist countries directly participated in the conflict, mostly in the pro-Republican International Brigades.

Anarcho-syndicalism is an anarchist organisational model that centres trade unions as a vehicle for class conflict. Drawing from the theory of libertarian socialism and the practice of syndicalism, anarcho-syndicalism sees trade unions as both a means to achieve immediate improvements to working conditions and to build towards a social revolution in the form of a general strike, with the ultimate aim of abolishing the state and capitalism. Anarcho-syndicalists consider trade unions to be the prefiguration of a post-capitalist society and seek to use them in order to establish workers' control of production and distribution. An anti-political ideology, anarcho-syndicalism rejects political parties and participation in parliamentary politics, considering them to be a corrupting influence on the labour movement. In order to achieve their material and economic goals, anarcho-syndicalists instead practice direct action in the form of strike actions, boycotts and sabotage. Anarcho-syndicalists also attempt to build solidarity among the working class, in order to unite workers against the exploitation of labour and build workers' self-management.

The foundations of anarcho-syndicalism were laid by the anti-authoritarian faction of the International Workingmen's Association (IWMA) and developed by the French General Confederation of Labour (CGT). Anarcho-syndicalism was constituted as a specific tendency following the International Anarchist Congress of Amsterdam in 1907, which led to anarcho-syndicalism becoming the dominant form of trade union organisation in Europe and Latin America. After facing suppression during the Revolutions of 1917–1923, anarcho-syndicalists established the International Workers' Association (IWA) in 1922. Anarcho-syndicalism reached its apex during the Spanish Revolution of 1936, when the National Confederation of Labour (CNT) established an anarcho-syndicalist economy throughout much of the Spanish Republic. Anarcho-syndicalism went into decline after the defeat of the anarchists in the Spanish Civil War in 1939. The movement split into two factions: the "orthodox" faction, which held to traditional syndicalist principles in spite of changing material conditions; and the "revisionist" faction, which aimed to achieve a mass base and work within the framework of newly established welfare states. By the end of the 20th century, the rise of neoliberalism and the collapse of the Eastern Bloc had led to a revival in anarcho-syndicalism, with syndicalist unions once again being established throughout the globe.

The Spanish coup of July 1936 was a military uprising that was intended to overthrow the Spanish Second Republic, but precipitated the Spanish Civil War, in which Nationalists fought against Republicans for control of Spain. The coup was organized for 18 July 1936, although it started the previous day in Spanish Morocco. Instead of resulting in a prompt transfer of power, the coup split control of the Spanish military and territory roughly in half. The resulting civil war ultimately led to the establishment of a fascist regime under Francisco Franco, who became ruler of Spain as caudillo.

The rising was intended to be swift, but the government retained control of most of the country including Málaga, Jaén and Almería. Cádiz was taken by the rebels, and General Gonzalo Queipo de Llano managed to secure Seville. In Madrid, the rebels were hemmed into the Montaña barracks, which fell with much bloodshed. On 19 July, the cabinet, headed by the newly appointed prime minister José Giral, ordered the distribution of weapons to the unions. With the defeat of the rebels in Madrid, Barcelona, and Valencia, anarchists took control of large parts of Aragon and Catalonia. The rebel General Goded surrendered in Barcelona and was later sentenced to death and executed. The rebels secured the support of around half of the Spanish Army, which totalled about 66,000 men, including large numbers who were on leave, as well as the 30,000-strong army of Africa. The army of Africa was Spain's most professional and capable military force. The government retained less than half the supply of rifles, heavy and light machine guns, and artillery pieces. Both sides had few tanks and outdated aircraft, while naval capacity was reasonably even. The defection of many regular officers weakened Republican units of all types.

The Republican faction (Spanish: Bando republicano), also known as the Loyalist faction (Bando leal) or the Government faction (Bando gubernamental), was the side in the Spanish Civil War of 1936 to 1939 that supported the government of the Second Spanish Republic against the Nationalist faction of the military rebellion. The name Republicans (republicanos) was mainly used by its members and supporters, while its opponents used the term Rojos (Reds) to refer to this faction due to its left-leaning ideology, including communist and anarchist groups, and the support it received from the Soviet Union.At the beginning of the war, the Republicans outnumbered the Nationalists by ten-to-one, but by January 1937 that advantage had dropped to four-to-one.

The Nationalist faction (Spanish: Bando nacional), also called the Rebel faction (Spanish: Bando sublevado) and Francoist faction (Spanish: Bando franquista), was a major faction in the Spanish Civil War of 1936 to 1939. It was composed of a variety of right-leaning political groups that supported the Spanish Coup of July 1936 against the Second Spanish Republic and Republican faction and sought to depose Manuel Azaña, including the Falange, the CEDA, and two rival monarchist claimants: the Alfonsist Renovación Española and the Carlist Traditionalist Communion. In 1937, all the groups were merged into the FET y de las JONS. After the death of the faction's early leaders, General Francisco Franco, one of the members of the 1936 coup, headed the Nationalists throughout most of the war, and emerged as the dictator of Spain until his death in 1975.

The term Nationalists or Nationals (nacionales) was coined by Joseph Goebbels following the visit of the clandestine Spanish delegation led by Captain Francisco Arranz requesting war materiel on 24 July 1936, in order to give a cloak of legitimacy to Nazi Germany's help to the Spanish rebel military. The leaders of the rebel faction, who had already been denominated as 'Crusaders' by Bishop of Salamanca Enrique Pla y Deniel – and also used the term Cruzada for their campaign – immediately took a liking to it.

The Popular Front (Spanish: Frente Popular) was an electoral alliance and pact formed in January 1936 to contest that year's general election by various left-wing political organizations during the Second Spanish Republic. The alliance was led by Manuel Azaña. In Catalonia and the modern-day Valencian Community, the coalition was known as the Front of the Lefts (Catalan: Front d'Esquerres).

The Popular Front included the Spanish Socialist Workers' Party (PSOE), Communist Party of Spain (PCE), and the republicans: Republican Left (IR), (led by Azaña) and Republican Union (UR), led by Diego Martínez Barrio. This pact was supported by Galician (PG) and Catalan nationalists (ERC), the POUM, socialist union Workers' General Union (UGT), and the anarchist trade union, the Confederación Nacional del Trabajo (CNT). Many anarchists who would later fight alongside Popular Front forces during the Spanish Civil War did not support them in the election, urging abstention instead.

Francisco Paulino Hermenegildo Teódulo Franco Bahamonde (4 December 1892 – 20 November 1975) was a Spanish general and dictator who led the Nationalist forces in overthrowing the Second Spanish Republic during the Spanish Civil War and thereafter ruled over Spain from 1939 to 1975. This period in Spanish history, from the Nationalist victory to Franco's death, is commonly known as Francoist Spain.

Born in Ferrol, Galicia, into an upper-class military family, Franco served in the Spanish Army as a cadet in the Toledo Infantry Academy from 1907 to 1910. While serving in Morocco, he rose through the ranks to become a brigadier general in 1926 at age 33. Two years later, Franco became the director of the General Military Academy in Zaragoza. As a conservative and monarchist, Franco regretted the abolition of the monarchy and the establishment of the Second Republic in 1931, and was devastated by the closing of his academy; nevertheless, he continued his service in the Republican Army. His career was boosted after the right-wing CEDA and PRR won the 1933 election, empowering him to lead the suppression of the 1934 uprising in Asturias. Franco was briefly elevated to Chief of Army Staff before the 1936 election moved the leftist Popular Front into power, relegating him to the Canary Islands.

The Spanish Republican Armed Forces (Spanish: Fuerzas Armadas de la República Española) were initially formed by the following two branches of the military of the Second Spanish Republic:

• Spanish Republican Army (Ejército de la República Española (1931–1936) and Ejército Popular de la República Española (1936–1939)). It included the Aeronáutica Militar air arm.
• Spanish Republican Navy (Marina de Guerra de la República Española), which included the naval aviation (Aeronáutica Naval).
• Spanish Republican Air Force (Fuerzas Aéreas de la República Española) (FARE)