Unfortunately the idea that one country can be great all on its own is now archaic (isolationism).
— Pantagruel
That would depend on the definition of great that you use. — Sir2u
I don't think so. To be great, you must first be good. A thing is good if it functions well, or performs its functions well. America is a society. So when does a society function well? A society is a complex system. The question is, does the geographical domain of America truly contain that system? Or does that only describe some of the parameters of its operation?
In the past, it was possible for cultures to exist side by side and yet function almost independently. Separation in space contributed to a separateness of identity. Points of exchange between two cultures were few and limited, trade and traders, markets, possibly some inter-marriage.
Fast forward to the modern era. The corporations which rule the world span global divides of natural and cultural boundaries. Small, isolated and under-developed nations are not permitted to evolve in peace but are economically invaded for their resources, and forced to embrace a suddenly modernized version of culture, a culture now no longer uniquely their own.
America is not the source of this cultural model, although there are those who may boast and think this is so.
America is the sum of all its inhabitants. But the lifestyle of these people is determined by the actions of corporations, aligned with no national interests, no interests but their own growth. Gradually all cultures are being smoothed into a generic brand of modernity. At one time, national identity was the most inclusive interest-group to which anyone could hope to belong. Now, global telecommunication makes it possible for each person to communicate with virtual enclaves of individuals dispersed across the globe but aligned with us in values.
No, there is no "America" any more to make great again, any more than there is a "Canada." Instead, we are a world of a million factions. Villages of rec.crafts.quilting, alt.games.chess . And alt.right, and alt.left . I wonder how many people ever think anymore of the origins of that banner, alt.right, in the usenet culture? It is "alt" because it exists in the alternative hierarchy, which was everything that was not in the mainstream comp, misc, news, rec, soc, sci and talk hierarchies. Alt.right.makeamericagreat is just another interest group, right alongside rec.games.computer, and rec.crafts.quilting.
Alt.right is just a faction of shared interests. And if it is truly alt, then it is because it sets itself apart from the mainstream, the majority. So what right could alt.right possibly have to impose its particular version of values on the rest of us, those who do not include alt.right among our chosen set of interests?
If there is a society, then its lines should be drawn around the clusters of interests which we share with each other. Sci.bio.earth . Soc.rights-human. The big ones. The ones that include us all. Share your alt.right or your alt.left values with your alt.friends . We need to save the mainstream, and the mainstream has to include everyone. Even if you are in America, you are not just an American. You have bigger responsibilities. We all do.