During the Great War the combatant countries had to mobilize for war in order to conduct it successfully. This meant that the industry had to accelerate the production of war matériel. The warring countries also had to galvanize their societies for war in order to maintain morale, and to mobilize their soldiers. The results varied from country to country, depending on the political and social situations of each. The war also brought important social changes, with the working class feeling the brunt of hardships on the home front. Demonstrations and strikes took place in almost every major combatant country, and, in some places, even revolutions during or after the war. The war also saw the advancement of women who took jobs in industry and agriculture that had been, thus far, traditionally associated with men. After the war, in many European countries, universal suffrage was introduced.