Sokoloff and Engerman explained this convergence in their article "History Lessons: Institutions, Factor Endowments, and Paths of Development in the New World." They explained that the United States and Canada started out as two of the poorest colonies in the New World but grew faster than other countries as a result of their soil qualities. They argued that the United States and Canada had land suitable for growing wheat which meant that they had small scale farming, since wheat does not benefit from economies of scale, and this led to a relatively equal distribution of wealth and political power enabling the population to vote for broad public education. This differentiated them from countries such as Cuba that had land suitable for growing sugar and coffee. Such countries did benefit from economies of scale and so had large plantation agriculture with slave labor, large income and class inequalities, and limited voting rights. This difference in political power led to little spending on the establishment of institutions such as public schools and slowed down their progress. As a result, countries with relative equality and access to public education grew faster and were able to converge on countries with inequality and limited education.