WI the Booth Conspiracy is a complete success?

[Polyphemus]

While in the popular consciousness the assassination of Abraham Lincoln is framed as the actions of a lone fanatic, in reality John Wilkes Booth was the only successful assassin out of a small group. The plan was to launch a decapitation strike of the United States government: Booth would kill Lincoln at Ford's Theatre, along with his intended guest for the evening, General Ulysses S. Grant. Meanwhile, other conspirators elsewhere in the city were tasked with murdering Vice President Andrew Johnson and Secretary of State William Seward.

Ultimately, only Lincoln was killed. Grant had declined the invitation to the theatre, the assassin tasked with killing Johnson got cold feet at the last minute, and despite stabbing and pistol-whipping multiple people during a lunatic rampage through Seward's house the final would-be assassin also failed.

Let's say that Grant accepted Lincoln's invitation, Johnson's assassin found his nerve, and Seward's assassin managed to cut Seward's throat. With the four most prominent men in antebellum America dead, what happens next?

 

[Roger II]

Well we get full Radical Reconstruction with land to the tiller, Johnson's out of the picture, and Jeff Davis will hang from a sour apple tree. So...critical support to Atzerodt? I guess the other big change is no Alaska, which could have very interesting knock-on effects for BNA.

 

[OwenM]

ISTR some concens over what exactly the legal situation would be in terms of the Secretary of State then being responsible for organising the election to replace Wade's interim presidency?

 

[marktaha]

Actually President Foster 1865.

 

[Simon]

I guess the other big change is no Alaska, which could have very interesting knock-on effects for BNA.

IIRC Russia offered it for sale to Britain, and then to the US – possibly hoping to work up the bidding – but the American Civil War got in the way. Does it change massive amounts if the Great White North becomes the Great(er) White North?