Team America, World Police. They may not have the decisive edge they had 60+ years ago, but they still represent something. Having more carriers is indicative

Team America, World Police. They may not have the decisive edge they had 60+ years ago, but they still represent something. Having more carriers is indicative of the United States' willingness to be the biggest military superpower on the planet. It helps to secure economic power/influence. It helps to push their agenda. Also, certain groups in the US (including the current president) would argue that the only reason other developed nations haven't engaged in this type of military building is because the US has done it and they've relied on that proxy strength.