The territory contained land that forms Arkansas, Missouri, Iowa, Oklahoma, Kansas, and Nebraska; the portion of Minnesota west of the Mississippi River; a large portion of North Dakota; a large portion of South Dakota; the northeastern section of New Mexico; the northern portion of Texas; the area of Montana, Wyoming
If you refer to Meriwether Lewis (Meriwether was his mother's surname actually), an American Explorer and a leader of the Lewis and Clark expedition, partially named after him, then he was born in the Colony of Virginia, a British Colony and part of the British Empire.
Yes it would be the third one
The period 600 CE to 1450 CE is characterized by the opening of important trade routes between the world known then: Europe, Asia and Africa mainly. The intensification of trade implied a spread of languages, culture (religion) and customs of different peoples. With trade, products and diseases were also exchanged that made the revision of local beliefs and traditions necessary and permanent. To reconfigure the forces of power in those times, innovation was important and in many cases the adoption of religious systems or institutions was a good start for the reorganization of declining societies that should flourish after the fall of the great world empires.