It is sectarian in the US in the sense that we have an active Libertarian party.
In a more general philosophical sense it can refer to the US as a "Masonic experiment".
It's very difficult to walk the line between what is partisan in politics and what is not, which is why some jurisdictions ban political discussion of all type.
From the context I pretty sure he meant “libertine” - I held a BA proficiency in Spanish (although I had only a minor) 30 years ago not so much anymore - but he used the adjective form “libertinaje”
Sent from my iPhone using My Freemasonry mobile app