US troops in Afghanistan (Joe Raedle/Getty Images)

International diplomacy requires countless decisions: the large, small, mundane and monumental. Some turn out to have been wise and some not; some can be corrected, while others bring consequences that must be survived. A few are so pivotal that they reset the course of history.
We can’t be certain how the world would be different had a different course been chosen, but we can identify turning points and their cascading tumbles of consequences. And we can hypothesise an alternative history that, absent some fateful step, might have unfolded instead. Such “Planet Ifs” are more than thought experiments; if we can uncover what these wrong turns have in common, we can try harder to avoid them in the future. To see how, let’s consider four.
The first is almost as old as America: What if the United States had never permitted slavery? Slavery, after all, was an ethical transgression, while the Civil War that followed ripped the country apart. Today, slavery’s toxic effects still impact the nation — socially, economically, culturally, politically. Nor was this outweighed by any significant benefits, as plantation-style farming was not essential to southern agriculture. A national story free of slavery would thus be indisputably preferable. Case closed.
On to our second Planet If, this time in Europe: What if the Treaty of Versailles had refrained from deliberately humiliating Germany after the First World War? The Treaty placed exceptionally harsh conditions on defeated Germany. The Bundestag was forced to cede territory and portions of its population, to accept burdens that prevented their economic recovery, and to demilitarise and to pay massive reparations. Such a vindictive stance fuelled Germany’s subsequent nationalism, with economic despair rendering its populace vulnerable to the recovery and pride promised by Hitler.
This lesson was learned by the end of the Second World War. In 1945, few would deny that a contemptuous and vindictive attitude towards Germany would have been warranted — but the decision was made to aim for rehabilitation and reintegration into the international system. They were obliged to pay reparations, and there was mandatory public education about the camps and the genocide, but there was also a roadmap for Germany’s return to being a normal and respected nation. Had such an approach been taken in 1918, it is entirely possible that we would not have had the Second World War. It seems unlikely Hitler would have seized power. And projecting forward: no expulsions of Jews, no genocide, and therefore no Israel, no Middle-East conflict, no PLO, no Hezbollah, no Hamas, and no Gaza War.
Third, let’s visit a more recent Planet If: What if Mohammad Mosaddegh, a secular reformer, had been allowed to remain as Iran’s elected Prime Minister?
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