Origins

Hmong people are the first to settle into the Yellow River before the Chinese takes over. Hmong moves southwards to the upper Yangtze river. Chinese expands south and Hmong moves more southwards towards the borders of S.E Asia. Not until the 18th Century does the Hmong finally moves south because of the Qing Dynasty that wars against the Hmong.

Origins
The Hmong ethnicitiy belongs to the Sino-Tibetan family, and have their own language family, known as the "Hmong-Mienic". There is a folk story that the elders talk about that once ago they use to live in a land of snow (Which is presumed North-East Asia/Siberia) and that they use to live in Northern China. Thus is the reason why Hmong never burn their dead and point their coffins toward present day Beijing.

Migration
In the following the Map, it shows that the Hmong migrated from Siberia and into North -East Asia until finally South-West China.

Yellow River
BC 3898 ∼ BC 2333

There were two major tribes, the Jiuli and the Huangdi. One Day Huangdi (The Yellow Emperor) joined forces with Shennong and together fought with the Jiuli. With the Jiuli deafeated, his three sons seperated. His oldest fled to the south, his middle to the north and his youngest stayed.

Yangtze River
5000 BC ~ 3000 BC



During this period, a new neolothical age came known as the Daxi civilization ( (大溪文化) (다시 문화) who were the first to cultivate rice in Asia.

I'd argue that Daxi culture is the earliest of proto-Hmong origin. Daxi culture was contemporary with Yangshao, (Yangshao was at the Yellow River and according to archealogical evidence, are Sinic). Earliest rice was from the south. Proto-Hmong-Mien are believed to be the first cultivators of rice. (Yangtze River).The haplogroup O3,O2, and O1 are of southeastern origin. There is noway for East Asians to have migrated from Siberia. Hmong peopleare O3a3.Proto-Hmong did not settle at the Yellow afterSiberia because Proto-Hmong did not come from Siberia. (refer tomy cited articles for this).Some Miao (Miao Hunan) people show stronger northern lineages than Mien.(http://mbe.oxfordjournals.org/cgi/content/full/22/3/725) This is probably because of the contact between Daxi and Yangshao culture as well as San Miao and Zhou periods. This is probably why Hmong people have a proverb refering to the Yellow River despite no archealogical evidence of Miao-yao at the Yellow River.

The haplogroup O3,O2, and O1 are of southeastern origin. There is no way for East Asians to have migrated from Siberia. Hmong people are O3a3. Proto-Hmong did not settle at the Yellow afterSiberia because Proto-Hmong did not come from Siberia. (refer tomy cited articles for this). Some Miao (Miao Hunan) people show stronger northern lineages than Mien. This is probably because of the contact between Daxi and Yangshao culture as well as San Miao and Zhou periods. This is probably why Hmong people have a proverb refering to the Yellow River despite no archealogical evidence of Miao-Yao at the Yellow River.