Puerto Ricans are American. Is it a problem that white Southerners identify more as Southerners than Americans?
Well Southerners tried to rebel, were defeated, lost their representation in our government for a time, suffered occupation for a generation, and are generally denigrated by our national media, their symbols are actively being destroyed, etc.
Their situation is akin to the Irish in Great Britain, a conquered people who really aren't happy about it. We've been trying to stamp out their culture since the end of the war but they stubbornly persist in it. They're like the Irish in Great Britain really. Their culture is not foreign but completely American, they cling not to their European roots but to their long-standing American roots. Not comparable to foreigners holding on to foreign identity.