Few may celebrate the half-century since Charles de Gaulle’s triumphs of 1958, says Robin Harris, but this realist genius understood that, in geopolitics, the nation-state was allAlmost exactly half a century ago, on 1 June 1958, Charles de Gaulle became the last Prime Minister of the French Fourth Republic and immediately began the construction of the Fifth. The Fourth Republic, be it said, was not as bad as it was painted, not least by de Gaulle. The economy had grown, the communists were kept out, and France took the first steps to becoming a nuclear power. But the system was incestuous and unstable, a small group of small men swapping posts in nominally different governments — all incapable of decisive action.