1.War and revolution 1914-1923: between 1871 and 1914, rivalries between European countries had resulted in the formation of two powerfull alliances that fought against another during the first world war.*The wartime economy was dominated by military needs. Many 19 century industrial and technological advances were used to manufacture weapons and other military equipment.*Society was transformed by the war. For example, while men were fidhting in the armed forces, many women worked in the factories.*Russia´s participation in the first World War had severe effects on its population.This was one of the causes of the Russian Revolution.*Spain remained neutral during the first World War, but the government had to deal with a series of political, economic and social problems, as well as a military conflicto in north africa.*During this period, the Avant-garde movement greatly influenced art.