Forget the Dominican Republic, would we still buy Alaska. I am sure Lincoln would support Seward in that but how much influence would Lincoln still have by 1867. I think he would have been headed for an out and out war with the Stevens/Wade wing of the Republican party with unpredictable results. I am not necessarily implying he would have faced impeachment, but depending on the results of the 1866 elections (and how many if any ex-rebel states would be participating) he could have been either empowered or politically emasculated. Although a tragedy, his assassination at precisely that time was the best possible event to ensure his historical legacy. These are Mothra-sized butterflies being released and I do not want to start waving nets at them.