is one of the 26 states of the Federative Republic of Brazil and is named after Saint Paul of Tarsus. As the richest Brazilian state and a major industrial complex, often dubbed the "locomotive of Brazil", the state is responsible for 33.9% of the Brazilian GDP. São Paulo also has the second highest Human Development Index (HDI) and GDP per capita, the fourth lowest infant mortality rate, the third highest life expectancy, and the third lowest rate of illiteracy among the federative units of Brazil, being by far, the safest state in the country. The homicide rate is 3.8 per 100 thousand as of 2018, almost 1/4 of the Brazilian rate. São Paulo alone is richer than Argentina, Uruguay, Paraguay and Bolivia combined. The economy of São Paulo state is the most developed in Brazil. São Paulo is also the world's twenty-eighth-most populous subnational entity and the most populous subnational entity in the Americas.