system and restore his prestige. This failed utterly, as the King was considered a supporter of the dictatorship, and more and more political forces called for the establishment of a republic. In 1931, republican and socialist parties won a major victory in the local elections, while the monarchists were in decline. Street riots ensued, calling for the removal of the monarchy. The Spanish Army declared that they would not defend the King. Alfonso flees the country, effectively abdicating and ending the Bourbon Restoration phase which had started in the 1870s. A Second Spanish Republic emerges. In the Soviet Union, agricultural collectivization and rapid industrialization take place. Millions died during the Holodomor. More than 25 million people migrate to cities in the Soviet Union. Anglo-German Naval Agreement is signed in 1935, removing the Treaty of Versailles' level of limitation on the size of the Kriegsmarine (navy). The agreement allows Germany to build a larger naval force. Éamon de Valera introduces a new constitution for the Irish Free State in 1937, effectively ending its status as a British Dominion. The "Great Purge" of "Old Bolsheviks" from the Communist Party of the Soviet Union takes place from 1936 to 1938, as ordered by Soviet Union leader Joseph Stalin, resulting in hundreds of thousands of people being killed. This purge was due to mistrust and political differences, as well as the massive drop in Grain produce. This was due to the method of collectivization in Russia. The Soviet Union produced 16 million lbs of grain less in 1934 compared to 1930. This led to the starvation of millions of Russians. The 1937 World's Fair in Paris, France displays the growing political tensions in Europe. The pavilions of the rival countries of Nazi Germany and the Soviet Union face each other. Germany at the time was internationally condemned for Luftwaffe (its air force) having performed a bombing of the Basque town of Guernica in Spain during the Spanish Civil War. Spanish artist Pablo Picasso depicted the bombing in his masterpiece painting Guernica at the World Fair, which was a surrealist depiction of the horror of the bombing. Referendum in the Irish Free State in December 1937 on whether Ireland should continue to be a constitutional monarchy under King George VI or to become a republic results in citizens voting in favour of a republic, ending the remains of British sovereignty through monarchial authority over the