By which of the following centuries was democracy generally adopted and commonly practised?

Question

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Democracy as a commonly practiced form of government was not widely adopted until the twentieth century. Prior centuries saw the gradual development and spread of democratic ideas, but it was in the 20th century that many countries around the world adopted democracy through decolonization, the fall of many monarchies and empires, and the spread of democratic ideals following the two World Wars.

By Which of the Following Centuries Was Democracy Generally Adopted