 
 <prompt> Wetin be oda important achievements wey happun as domino effect of Wu's campaigns? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The Xiongnu, wey be nomadic steppe confederation, knack Han for 200 BC and force Han make dem submit as inferior partner, but dem still dey raid Han borders. Emperor Wu of Han (r. 141–87 BC) launch plenty military campaigns against dem. The final Han victory for these wars eventually force Xiongnu make dem accept vassal status as Han tributaries. These campaigns expand Han control reach Tarim Basin for Central Asia, divide Xiongnu into two separate confederations, and help establish the big trade network wey dem dey call Silk Road, wey reach as far as Mediterranean world. The territories wey dey north of Han's borders quick quick fall into the hands of nomadic Xianbei confederation. Emperor Wu also launch successful military expeditions for south, annex Nanyue for 111 BC and Dian for 109 BC, and for Korean Peninsula where Xuantu and Lelang Commanderies dey established for 108 BC. 