There are many reasons why the United States of America will become un-united and the facts can be viewed through many different lenses. One lens is through the NFL issue. Where sycophants of Colin Kaepernick say they kneel during the national anthem to draw attention to the inequality of minorities in America, specifically blacks, that rings hollow to the veterans, police officers and patriots of America (many of whom are blacks themselves) who recognize the flag and the national anthem as symbols of freedom and justice. The protests, therefore, must be against America and a criticism of the values America espouses, whether it is always faithful to those values or not. It is, like it or not, a question of American allegiance or rebellion.
Another lens is through the freedom of religion issue.
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