Gálvez's zeal to more effectively organize the overseas administration led him to also establish the Viceroyalty of Rio de la Plata (1776) from territories of the Viceroyalty of Peru, and the Captaincy General of Venezuela (1777) from parts of the Viceroyalty of New Granada. He also created the Captaincy General of Venezuela in order to promote the population and economy of the area; For this purpose, in 1776 he named his fellow Malaga native Luis de Unzaga for his diplomatic skills, Unzaga, known as "le Conciliateur" the next time he will leave his nephew, Bernardo de Gálvez as interim governor From Spanish Louisiana, replacing Unzaga, that same year he became brothers-in-law, when Bernardo married the little sister of Unzaga's wife; In this way, Minister José de Gálvez appointed Luis de Unzaga as the first Captain General of Venezuela in 1777 by bringing together various territories and creating a defense plan there that would also help achieve the birth of the United States. Both these new governments were intended to expand areas of settlement and stimulate the economy. He also established the Real Compañía de Filipinas and in 1778 founded the Archivo General de Indias, bringing together documents about the Indies from Simancas, Seville and Cádiz. Also in 1778 he established limited free trade among the colonies. As Minister of the Indies he was able to secure the appointment of his brother Matías as governor-captain general of Guatemala. Matías went on to serve as viceroy of New Spain.