The fact that some Americans supported slavery in the eighteenth century is not at all remarkable. Most of the world agreed with them. What is remarkable is that many of them sought to abolish slavery in the new republic.
New York and New Jersey have produced more COVID-19 deaths than the rest of the country combined. So politicians have repeatedly claimed that the nation is "two weeks behind New York" to drum up support for extreme lockdown measures.
If we regard nationalism as necessarily harmful, we end up supporting the Soviet Union, and every empire and two-bit dictator who manages to hammer together a variety of disparate groups under a single national banner.
The Iraqi parliament response to the recent US airstrike — expelling all US troops from Iraq — suggests that an escalation of the ongoing US-Iran conflict would not be as simple as pro-war factions of the US regime would like it to be.