The Paris World’s Fair of 1937 was more than a testing ground for artistic innovation; it was a battleground for political ideologies. The Imperial eagle spread its wings over the German Pavilion; the Soviet hammer swung above the Russian Pavilion; and the Spanish Pavilion unveiled Picasso’s shocking monument to the civilian dead of the bombed city of Guernica, raising the clenched fist of the Spanish Republic in the capital of non-interventionist France.