She reads the letter, and suggests to the Prime Minister, Lord Palmerston that something might be made of this. On leaving Balmoral, a grouse hunting party returns at the same time Pam is leaving, and a tragic accident follows. In the confusion following Pam's death, the Queen is able to prevail upon Parliament to accept the marriage proposal, and plans are put forward for the marriage. Compromise is the stuff of this timeline, so the solution put forward is to have the marriage in mid-Atlantic. Accordingly, a mighty and luxurious ship is built, making use of the best of British, American and Confederate skills.
Companies attempt to outdo each other on quality and etc.
The USA, CSA and Britain have been united. Then Emperor Norton dies, and the slavery issue blows up again. Britain leaves the American Experiment, while North and South fight, kill and die.