In the evolution of modern European nationalism, German cultural nationalism was concerned about the revival and protection of the German national cultural community. This trend of thought developed into the concern and guardianship of millions of German immigrants and their culture in the United States in the 19 th century, forming a transnational cultural nationalism based on the consciousness of the German cultural community. In the second half of the 19 th century, some German scholars in the United States not only argued for the defense of German culture in the United States from the historical, realistic and cultural levels, but also explored the fate of German culture in the United States. Their ideological perception experienced a great reversal from guarding narrow cultural nationalist myths and even thoughts of a possible “Germanization” of America, to a more rational consideration of the integration of German culture into American culture.