This was interesting. I'll go with a lob-ball pop history sort of thing. If you examine it too hard, it will fall apart.
The United Kingdom of the States of America
(Don't have a map, but i'll describe the territory.)
The grand idea of an American Republic would never materialize. The American Continental Congress had long debated on Articles of Confederation to govern their fledgling nation. Early on in their war for independence, there were debates in Congress to establish Articles of Confederation but Congress could not get a consensus to ratify them. With the British surrender at Yorktown in 1781, a true crossroads was upon the nation.
The French withdrew their support while the British had troops within the nation. The Continental Congress had failed to deliver a system of government, the current American treasury had been emptied, its troops growing weary, all the while General Washington being unsure if the British would resume hostilities. In what should have been a victory celebration for the American colonies, it was an hour of desperation with no resolution in sight.
Washington was well aware that if the colonies could not pull together as a nation, the entire endeavor was for naught. He, his troops, and his nation had suffered through too much to simply lay down and allow their dream die in Congress. With no other options, George Washington regretfully took matters into his own hands. He believed in the cause of creating a Republic, but it appeared that the time was not right.
General Washington marched to Philadelphia with what soldiers he had left, mostly men personally loyal to him. By the end of 1782, Washington declared the nullification of the Continental Congress, naming himself Dictator of the American Colonies. The Army rallied behind him, with nothing else to fight for. Newly invigorated, the Army was ready to fight again. By 1783, the Treaty of Paris officially ended the war. Britain assumed that the American experiment had failed, and felt they no longer needed to commit resources to a war as they certain the colonies would crumble and come crawling back.
Preferring to keep the title of "General", Washington sets about building the damn nation himself. It is still his ultimate goal to establish a Republic, but he refused to allow his work to be squandered by the politicians who couldn't make it happen. He fought the war to create the nation and if they won't build one, he would do it himself. With the support of the Army, and a willingness to use it when necessary, General Washington set about laying the groundwork for a stable Republic. Washington had worked with several of his other revolutionaries to draft a working model for the new state, to the point that a draft of a Constitution was created and Washington was ready to organization an election to step down as dictator.
Before that could happen, his second in command and temporary President of Congress John Adams plotted his demise. General Washington had been murdered, the story given to the public that the British assassinated their beloved leader. Historians would argue that it was Adams responsible, but could find no conclusive evidence. With no clear line of succession and the draft of the Constitution disappearing, Adams seized control. He used the fervor of the people against the British for their alleged crime to claim succession from General Washington. The people begrudgingly accepted, as they knew of the bond that Washington and Adams shared.
Washington's corpse was barely cold before Adams made his declaration, that Congress had once again failed the American people and with the travesty of the British attack on General Washington, immediate and drastic action was needed to secure the nation. Adam's announced, once again, the dissolution of Congress and declared himself King. The people were outraged, but were powerless. Washington had centralized power, intending to hand it off to an elected government but never giving the chance. The Army had become fanatical in their devotion to General Washington and King Adams was correct in his gambit that the fanaticism would continue on. On July 4th, 1791 King Adams was "officially" coronated and by decree, established the United Kingdom of the States of America. A new flag was unveiled, keeping the stripes of the colonial flag while honoring the beloved General Washington with integrating his family crest.
A new aristocracy established itself in the new Kingdom, the rich adopting the status of nobility and titles being bestowed by King Adams.
