IS A UNIFIED UNITED SATES POSSIBLE

The correct and straight forward answer to the question, is a unified United States possible, is no. Unity is never possible unless both sides want unity and are willing to compromise and accept the rights of the other side. For instance, we have had calls for decades now that the Palestinians and Jews live in harmony and peace. The Jews have said that despite their differences, they are willing to accept the Palestinian people and work for peace. The Palestinian leaders have said the only Jew they can ever accept is a dead Jew. That puts the Jewish people in a difficult position, no compromise on their part is acceptable. Only the Jewish people accepting their total and final demise, is acceptable to the Palestinians.
The factions in the United States are in a similar situation. The collectivists (Marxist, communist, socialist, progressive, Democrats, - all virtually the same) have told us individualists that the only compromise they are willing to accept is for us to renounce our core beliefs and join them in transforming our nation into a collectivist nation. The collectivist faction is demanding that any who would disagree with their ideology be censored. This censorship takes place many ways including silencing us by removing us from communicating on radio, television, in print, or on social media, demonizing us and ostracizing us through the means of enforcing what the collectivist deems to be politically correct, and canceling any who do not adhere to the collectivist line socially and economically.
The collectivist is also declaring that unity can only come about when we individualists are deprogrammed, are cleansed, or are imprisoned because our beliefs are different from theirs. Of course, this is not striving for unity but is demanding total conformity.
What has happened in the United States is that the two factions no longer have the same goals. The collectivist has as its goal to make the government the sovereign of all by dictating to the individual how they are to live their lives and what their thoughts can be. This is how collectivism believes you bring unity and harmony to a society.
The individualist believes that the supremacy of government is detrimental to the existence of a society in which the liberty and freedom of the individual is the very core of the desired outcome. The individualist believes that governments purpose is to protect freedom of speech and not curtail it through any form of censorship, that the role of government is to protect the sanctity of life and not destroy it by wholesale murder of the unborn, that government is to insure freedom of opportunity and not guarantee equal outcome, that government is to view each citizen as an individual and not as a part of a class to be punished or to be granted special privileges, and that the role of government should be to respect the importance of the core family unit to a free society as opposed to promoting all elements that destroy the core family unit such as immorality, sexual perversions, pornography of all sorts, the enabling of pedophiles and child trafficking, and that less government is always the best government.
For unity to come about, both factions must understand that people are individuals and as such are unique. Both sides have to understand that individuals being encouraged to dream and then to strive to fulfill those dreams is what has always brought about the advancement of society and is the greatest factor in reducing suffering of all kinds including poverty.
The situation in the United States is not much different from that in the Middle East. The one side, the collectivist, is telling the other side, the individualist, we can only accept you as a memory, you must be eliminated. I do not see that as a call to unity.