Can there be such a thing as 'National sin'?   Isaiah declares to Israel, "Oh, you sinful nation! You people burdened down by iniquity!" We see many places in scripture where Adonai deals with entire nations; from Sodom and Gomorrah to Isaiah's many oracles against Moab, Tyre, Egypt, Assyria, and many more. 
  But those were nations who were filled with individuals who were wicked, where there was unlikely even a handful of righteous souls - not even 10 could be found in Sodom!
Is it right for us as the individual disciples of the Master, who earnestly seek to do His will and follow His ways, to lump ourselves in with all the rest of the people who are the ones committing atrocities, and confess our national sins?  Why should I, a believer, confess these sins as if I participated or approved?  I guess that is really a question of how deeply you consider yourself a part of this nation.
  Yakov (James) 2:10 said that if we have broken even a single part of the commandments of Adonai we have broken all of it. I have certainly broken at least one small part of His commandments somewhere. So, it is reasonable to say I am guilty of murder even if I have never taken another life by my own hand. And if I am a part of this nation, then I am aligned with others who are part of this nation in the laws they have broken.
  The clearest example of one who saw himself as a participant in the sins of the nation is Daniel.  This righteous man, whom Adonai held in such esteem that He closed the mouths of lions, include himself in confessing national sin; " ...  "we have sinned; we have committed iniquity; we have acted wickedly; we have rebelled; we have turned away from Your mitzvot and from Your rulings. We have not listened to Your servants the prophets. ...  shame covers our face to this day" (Dan 9:5-7). 
  Whether it be the sins of the past (slavery, forced expatriation) or the present (abortion, human trafficking, sexual immorality, violence and lawlessness) if we are a part of this nation, then we are a part of these national sins.  Yes, it is good for us to confess.  After all, can we expect a confession of sin by those who do not acknowledge the God against whom they sin?  It is up to us, who walk in imputed righteousness, to confess our unrighteousness as a nation.
  The attached document is a reformulation of the prayer of confession in Daniel 9.  It is written as a prayer of confession as a citizen of these United States, and not so much as a member of the nation or people of Israel.  I claim no copyright to it, and have kept it as a Word document that can be easily edited. Feel free to download and work it in your own words and way into a prayer that you can come before Adonai with sincerity. Also, pass it on to others and post on your own social media.