Agrarian reform and land reform has been a recurring theme of enormous consequence in world history — see, for example, the history of the Semproninan Law or Lex Sempronia agraria proposed by Tiberius Sempronius Gracchus and passed by the Roman Senate (133 BC), which led to the social and political wars that ended the Roman Republic.
A historically important source of pressure for land reform has been the accumulation of significant property by tax-exempt individuals or entities. In ancient Egypt, the tax exemption for temple lands eventually drove almost all the good land into the hands of the priestly class, making them immensely rich (and leaving the world a stunning legacy of monumental temple architecture that still impresses several millennia later), but starving the government of revenue. In Rome, the land tax exemption for the noble senatorial families had a similar effect, leading to Pliny's famous observation that the latifundia (vast landed estates) had ruined Rome, and would likewise ruin the provinces. In the Christian world, this has frequently been true of churches and monasteries, a major reason that many of the French revolutionaries saw the Catholic Church as an accomplice of the landed aristocracy. In the Moslem world, land reforms such as that organized in Spain by al-Hurr in 718 have transferred property from Muslims to Christians, who were taxable by much higher rates.
In the modern world and in the aftermath of colonialism and the Industrial Revolution, land reform has occurred around the world, from the Mexican Revolution (1917; the revolution began in 1910) to Communist China to Bolivia (1952, 2006) to Zimbabwe and Namibia. Land reform has been especially popular as part of decolonization struggles in Africa and the Arab world, where it was part of the program for African socialism and Arab nationalism. Cuba has seen one of the most complete agrarian reforms in Latin America. Land reform was an important step in achieving economic development in many Third World countries since the post-World War II period, especially in the East Asian Tigers and "Tiger Cubs" nations such as Taiwan, South Korea, and Malaysia.
Since mainland China's economic reforms led by Deng Xiaoping land reforms have also played a key role in the development of the People's Republic of China, with the re-emergence of rich property developers in urban areas (though as in Hong Kong, land in China is not privately owned but leased from the state, typically on very long terms that allow substantial opportunity for private speculative gain).