Here is a list of threads in other subreddits about the same content:

• HEA que Brasil participou da Primeira Guerra Mundial. Mandamos apenas 20 soldados, 86 médicos civis e a marinha destruiu um submarino on /r/brasil with 48 karma (created at 2016-08-10 04:12:41 by /u/LordLoko)
• TIL that Brazil fought in the WWI and is the only Latin American nation to fight in World War I on /r/todayilearned with 40 karma (created at 2016-11-12 04:44:43 by /u/Stanislav_)
• [May 3rd, 1916] Brazilian merchant ship Rio Branco is sunk by a German submarine. Because the ship is in restricted waters and registered under the British flag, and most of its crew is Norwegian, it is not considered an illegal attack by the Brazilian government, despite public protests. on /r/100yearsago with 8 karma (created at 2016-05-03 12:40:39 by /u/michaelnoir)
• [October 26, 1917] Brazil declares war on Germany. on /r/TheGreatWar with 1 karma (created at 2017-10-26 19:47:16 by /u/NateChampion)
• [October 26, 1917] Brazil declares war on Germany. on /r/ww1 with 1 karma (created at 2017-10-26 19:47:11 by /u/NateChampion)
• [July 27th, 1917] The steamer "Lapa Brazil" is hit by three torpedoes from a German submarine. on /r/100yearsago with 39 karma (created at 2017-07-27 18:50:38 by /u/michaelnoir)
• [May 3rd, 1916] Brazilian merchant ship Rio Branco is sunk by a German submarine. Because the ship is in restricted waters and registered under the British flag, and most of its crew is Norwegian, it is not considered an illegal attack by the Brazilian government, despite public protests. on /r/100yearsago with 39 karma (created at 2016-05-24 17:50:11 by /u/moanrigid90)

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