The USA is spreading their political, military, economic, scientific, artistic and cultural mission throughout the world. The aim of this paper is to bring to the attention the Americanization of the Croatian language particularly evident in the newly adopted language manners, in teenage language, in specialist languages, in the field of advertising and in political correctness. The spread of Americanization of the Croatian language has both negative and positive effects. Positive effects can be regarded as enrichment of the Croatian language, whereas the negative ones endanger its deep structure. Positive effects should be supported and negative minimized through the cooperation between experts in linguistics and politics.