I think, Actually all whole this, our strength, our diversities = our proud, But somethings really divide us our nation. I think two reason of the problem's resources, (generally)
Number 1# some immigrants come to america, They believe in american dream, they breath in under our flag, but defend self- national origin or birth country. Next step, Lobbying, Domestic threat, they not accept american nationality, american identity.
Politicians, Political Institutions.
Divide us, sometimes they not thinking interest of the U.S
We are one and (multicultural) nation for under american honor, we live with liberty and justice for all of us!!