The 1870s continued the trends of the previous decade, as new empires, imperialism and militarism rose in Europe and Asia. The United States was recovering from the American Civil War. Germany unified in 1871 and began its Second Reich. Labor unions and strikes occurred worldwide in the later part of the decade, and continued until World War I. The Reconstruction era of the United States brought a legacy of bitterness and segregation that lasted until the 1960s.