The world in 108 BC — what happened that year

7 events the sources record for this year, grouped by region.

What happened

After campaigning against Gojoseon, a summer drought came; Gongsun Qing called it a 'dry sealing' (qian feng), so a sacrifice to the Lingxing star was offered. (Records of the Grand Historian (Shiji), Annals 史記卷012 孝武本紀)
The left general broke the troops on the Pae River and besieged the northwest of the walls, while the admiral's fleet besieged the south. Wiggu held his city firmly for several months and it did not fall. The two generals were at odds. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑卷021 (원문 단락 #1620, -108년))

The upper class of Joseon killed King Ugeo and surrendered; four commanderies were established on the land: Lelang, Lintun, Xuantu and Zhenfan. (Book of Han (Hanshu), Imperial Annals 漢書卷006 武帝元封三年夏)
In summer, Ni-gyesang Cham had Ugeo killed and surrendered. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第一魏滿朝鮮)
Seong-i rebelled again; it was put down, and the four commanderies of Jinbeon, Imdun, Nangnang and Hyeondo were established. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第一魏滿朝鮮)

Hyrcanus's sons Aristobulus and Antigonus surround Samaria (later Sebaste) with a wall and besiege it (Josephus, Jewish War and Antiquities of the Jews BJ 1.64–66)

Marius is elected consul by an overwhelming margin and soon raises troops (Plutarch's Parallel Lives Plut. Marius 9.1)