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I know there have been a few threads about this in the past, but I have some questions about the possible consequences of Ivan IV not killing his son, Tsarevich Ivan Ivanovich, in a fit of rage. A possible PoD is the Tsarevich's wife wearing something different so Ivan IV isn't incited into attacking her. Anyway, my questions about the consequences of this PoD:
Would the course of the Livonian War turn out differently? As with most wars, I believe that logistics is the deciding factor and having the Tsarevich survive may not actually do that much to help the Russian cause.
Would serfdom still arise in Russia? In the other threads, people suggested that Boris Godunov would still be influential. However, I don't think Ivan Ivanovich is as malleable as his less capable brother, Feodor.
How would Ivan Ivanovich deal with the famine of 1601–1603? Could this cause the fall of the Rurik Dynasty?
Would Ivan Ivanovich modernize Russia to a greater extent than his OTL counterparts? I suppose this one has a lot to do with the outcome of the Livonian War.
Lastly, does anyone have any recommendations for books on late 16th/early 17th century eastern Europe?