Brazil, during the past thirty years, has undergone extensive social and economic change, amounting to a Brazilian “Industrial Revolution”. It is always somewhat arbitrary to assign dates to broad historical events, but, if establishment of a starting point for the Industrial Revolution would aid in its understanding, the best date is probably 1930. In the economic field, it is true, World War One represented a first step; in the cultural field, the Week of Modern Art (1922 in Sao Paulo) was the first significant manifestation of a really Brazilian culture. But in both cultural and economic fields, and especially in the political field, the Revolution of 1930 (when Getúlio Vargas came to power), and the world depression beginning in 1929, are the most important events. The phase that many sociologists, economists, and historians call either the National Revolution or the Industrial Revolution, the stage that W. W. Rostow prefers to call the take-off period, began at that time in Brazil.