Iran, once known as Persia, is a major regional power. Its size, history, and resources have enabled it to exert significant influence over its neighbors in the Middle East and Central Asia. Iran is one of the world's few countries where Shiite Muslims are a majority, and since 1979 it has been ruled by Muslim clerics as a theocracy. Many world leaders are concerned that Iran is trying to develop nuclear weapons, which would disrupt the fragile balance...