As the months went on, the crisis became acute. By mid-1952, an attempt by the Shah to replace Mossadegh backfired and led to riots against the Shah and perceived foreign intervention; Mossadegh returned with even greater power. At the same time, however, his coalition was weakening as Britain’s boycott of Iranian oil eliminated a major source of government revenue and strategically made Iranians poorer and thus unhappier by the day.