Did the Sioux live in longhouses?

Answer 1

The Sioux are not a single tribe but a group of related tribes divided by dialect: from east to west they are classed as Dakota, Nakota and Lakota. The Lakota or Teton Sioux were entirely Plains nomadic people living in tipis; their distant cousins the Dakota (made up of the Mdewakanton, Wahpeton and Sisseton tribes) were on the very margins of the Plains and used longhouses in semi-permanent villages. The middle group (Nakotas) sometimes lived in earth lodges like those of the Mandans and Hidatsas.

So, some Sioux tribes did live in longhouses, others never did.

Other more distantly-related tribes are classed as "Siouan" because they speak similar languages: the Omaha, Ponca, Kaws and others lived in earth lodges, again in semi-permanent villages on the edge of the Great Plains.

Answer 2

In general the Shawnee lived in small, round bark-covered wigwams they called wikkums or weekeewa, each occupied by a small family group. A larger council house in each village was built of timber and looked something like a longhouse, but it was only used for ceremonies and meetings.

See links below for images:

Answer 3

No.