Ronald Reagan's body arrived in Washington today. The "Geopolitical Diary" would not be complete if it did not note his passing. The very least that can be said is that he presided over the United States while the Soviet empire imploded. The very most that can be said is that his policies caused the Soviet Union to collapse. The truth probably rests between those two poles. Geopolitical events, like great economic processes, are never in the control of one man, and rarely are the result of conscious policies. People argue that the Soviet Union was driven to ruin by the American arms race and that Reagan knew this would happen. The fact is the Soviet Union was moving toward ruin because of an unsustainable social system and because of serious geographical problems. Its agriculture and its rivers never matched up.