High Quality Content by WIKIPEDIA articles! Despite the then internal political conditions, Brazil entered into World War I in 1917, alongside with the Triple Entente, after initially adopting neutrality. Brazil's contribution was modest, essentially little more than symbolic from a military perspective. Still, Brazil was the only South American country to actually participate in the war beyond a formal declaration of war. Its primary contribution was in the naval war in the Atlantic, though it also sent a unit to the Western front.