John Fredrick Parker
Donor
How can the Constitution of 1876 last (at least a dozen years or so), or the return to absolutism be prevented (or delayed)? Would, for example, preventing or holding off the Russo-Turkish War be enough?
Have the Ottomans win the Russo Turkish war.
Easy. Have the Ottomans win against Russia.
I think Nasirrisimo's Ottoman TL deals with the premise of a continued Constitutionalist Ottoman Empire.