In Islam, was it possible for some religious/ethnic group/country/region to make change from Sunni to Shia or Shia to Sunni?
Were there cases that of such change? If yes, what did cause them?
In Islam, was it possible for some religious/ethnic group/country/region to make change from Sunni to Shia or Shia to Sunni?
Were there cases that of such change? If yes, what did cause them?
Iran is the most obvious and consequential historical case. From Wikipedia:
Following their rise to power in Iran in the 16th century, the Safavid dynasty initiated a campaign of forced conversion against the Iranian populace, seeking to create a new demographic environment in which Shia Islam would replace Sunni Islam as the nation's religious majority. Over the course of the next three centuries, the Safavids (who were Twelver Shias) heavily persecuted Sunni Muslims, Jews, Christians, and other religious groups, eventually transforming Iran into a spiritual bastion of Shia Islam.
In more recent times (particularly after the Islamic Revolution in Iran) there has been a trend of voluntary conversions in some places such as Indonesia. However I'm not sure how likely this will ever be to amount to a major demographic shift.