They are not a failed nation, they just do things differently. No harm in that.
Most of their people thing differently which sometimes is good and sometimes can be terrible.
Failure of a nation does not refer to how they do things (differently or otherwise).
Failure of a nation refers to quality of living, security, rule of law, monetary stability, etc.
Yes from your way of looking america, its not a failed nation in whatever way considered like living, security, rule, rights to people.etc. If america is considered by economy, curruption, wealth, Living standard also its not at all a failed nation. Some say it a failed nation just based on the leaders.