Via a Tweet from Ned Resnikoff, this letter from Karl Marx, congratulating President Lincoln on his re-election.
We congratulate the American people upon your re-election by a large majority. If resistance to the Slave Power was the reserved watchword of your first election, the triumphant war cry of your re-election is Death to Slavery. From the commencement of the titanic American strife the workingmen of Europe felt instinctively that the star-spangled banner carried the destiny of their class. The contest for the territories which opened the dire epopee, was it not to decide whether the virgin soil of immense tracts should be wedded to the labor of the emigrant or prostituted by the tramp of the slave driver? … The workingmen of Europe feel sure that, as the American War of Independence initiated a new era of ascendancy for the middle class, so the American Antislavery War will do for the working classes. They consider it an earnest of the epoch to come that it fell to the lot of Abraham Lincoln, the single-minded son of the working class, to lead his country through the matchless struggle for the rescue of an enchained race and the reconstruction of a social world.
With an official response from the US Ambassador to the Court of St. James:
I am directed to inform you that the address of the Central Council of your Association, which was duly transmitted through this Legation to the President of the United [States], has been received by him. So far as the sentiments expressed by it are personal, they are accepted by him with a sincere and anxious desire that he may be able to prove himself not unworthy of the confidence which has been recently extended to him by his fellow citizens and by so many of the friends of humanity and progress throughout the world. The Government of the United States has a clear consciousness that its policy neither is nor could be reactionary, but at the same time it adheres to the course which it adopted at the beginning, of abstaining everywhere from propagandism and unlawful intervention. It strives to do equal and exact justice to all states and to all men and it relies upon the beneficial results of that effort for support at home and for respect and good will throughout the world. Nations do not exist for themselves alone, but to promote the welfare and happiness of mankind by benevolent intercourse and example. It is in this relation that the United States regard their cause in the present conflict with slavery, maintaining insurgence as the cause of human nature, and they derive new encouragements to persevere from the testimony of the workingmen of Europe that the national attitude is favored with their enlightened approval and earnest sympathies.