Christian privilege
The concept of hegemony describes the ways in which a dominant group, in this case mainly U.S. Protestant Christians, disseminate their "dominant" social constructions as common sense, normative, or even universal, even though most of the world's inhabitants are not Christian. Christian hegemony also accepts Christianity as part of the natural order, even at times by those who are marginalized, disempowered, or rendered invisible by it. Thus, Christian hegemony helps to maintain the marginality of other religions and beliefs. According to Beaman, "the binary opposition of sameness/difference is reflected in Protestant/minority religion in which mainstream Protestantism is representative of the 'normal'".
Posthegemony
The predictions of these individuals represent the fluidity of power over time, through the idea that, during the period where the US was unequivocally dominant, people could still see the inevitable future, of a change in power and authority, on the world stage.