There is more than one global worldview.
As the song sings: “In Christ there is no east or west, in Him no north or south” and as Saint Paul proclaims: “There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus.”
A global worldview is inherent to Christianity (even if political forces result in the surrender of authority to the State at times); however, while we are ‘all in this together’ in Christ, this is only true IN Christ. Even then, the sin inherent in our human condition makes this being together very difficult.
The Church is careful to balance its social doctrine of solidarity with one another with the doctrine of subsidiarity: that issues should be dealt with as locally as possible. Subsidiarity reduces moral hazard whereas legislating from a distance increases the time it will take to feel the bad consequences of wrong actions.
To support a specifically secular global agenda is to think our unity need not be IN Christ, that we can bring forth large scale good community on our own. This is haughty Pelagianism.
To support American nationalism over a specifically secular global hegemony is to be orthodox in Christian doctrine.