Accidentalism and catastrophism were two differing ideologies in Spain in the inter-war period. They were particularly noticeable among opponents of Spain's Second Republic (1931–1939) – most significantly of the liberal and socialist governments of 1931–1933 and 1936 until the start of the Spanish Civil War. The opposition press and groups tended to fall into one of the categories, which would both hold sway during the period of the Republic.