In his early years, Marx, inspired by Hegel, believed that history is a process of dynamic evolution. Therefore, he also paid attention to the replacement of social forms and the differences in social forms among different ethnic groups. While Hegel believed that the driving force of historical progress lies in spirit, Marx focused more on the role of material in it. Thus, in his theories of social forms and world history, Marx emphasized the historical progress brought about by changes in the mode of production. Based on this, Marx expounded his views on the evolution of social forms and the development status and prospects of world history. He consistently held a equality political inclination and continued to pay attention to the oppression suffered by backward nations. This paper summarizes Marxs social form theory, world history theory, and his related discussions on backward nations in his historical philosophy. It outlines the global perspective from the internal social evolution of nations to the coordinated development of the world, and then to Marxs humanitarian care for backward nations.