The history of Aracaju is closely tied to the economic and political ambitions of the state of Sergipe in the mid-19th century. The city was officially founded on March 17, 1855, becoming one of the first planned cities in Brazil. Its creation was a deliberate decision designed to transfer the state capital from the old colonial city of São Cristóvão to a location that was more advantageous from a geographical and commercial perspective.
A key factor in the rise of Aracaju was its strategic location on the Atlantic coast, at the estuary of the Sergipe and Poxim rivers. This provided ideal conditions for the construction of a seaport, which was necessary to increase exports of sugar and other commodities. Moving the capital was also a political move aimed at modernizing the administration and weakening the influence of the old elites based in São Cristóvão. The city was designed from scratch, which is reflected in its recognizable layout with straight streets forming a grid.
From the very beginning, Aracaju's economy was focused on port activities and trade. The city quickly turned into the main economic hub of the region, through which agricultural exports passed. Early urban culture was shaped by its capital status and the cosmopolitan character of a port centre. Unlike many older Brazilian cities with their colonial architecture, Aracaju developed initially as a modern administrative and business centre, which defined its future appearance.