United States in World War I
On the supply side, it has been observed that wars sometimes have the effect of accelerating technological progress to such an extent that an economy is greatly strengthened after the war, especially if it has avoided the war-related destruction. This was the case, for example, with the United States in World War I and World War II. Some economists (such as Seymour Melman) argue, however, that the wasteful nature of much of military spending eventually can hurt technological progress.