Brazil's declaration of war against the Central Powers on 26th October 1917 was a pivotal moment in the South American nation's foreign policy. Previously, Brazil maintained a position of neutrality during the onset of World War I. However, the intensification of German submarine warfare posed a direct threat to Brazilian shipping interests, as numerous Brazilian merchant vessels were sunk. The Brazilian government, led by President Venceslau Brás, recognized the need to respond to these provocations decisively. Alignment with the Entente Powers symbolized not only solidarity with allies, such as the United Kingdom and France, but also a strategic choice to enhance Brazil's international standing.In addition to political motivations, Brazil’s participation in the war adhered to a broader ideological stance against authoritarian regimes represented by the Central Powers. Brazil’s commitments included sending the 1st Brazilian Division to fight in Europe, participating in naval operations, and contributing resources to the Allies’ efforts. This marked a significant shift for Brazil, as it transitioned from a largely isolationist posture to a more interventionist approach on the global stage. The Brazilian Navy began escorting allied vessels in the Atlantic Ocean, playing a crucial role in mitigating the threat posed by German U-boats.The decision influenced various sectors within Brazilian society, igniting national pride and a sense of responsibility among its citizens. Brazil's involvement in the war altered the perception of the country's role in the world, signaling its intent to emerge as a more influential player in international affairs, especially in Latin America.