Conversation so far:
What did Thompson do during David Thompson (explorer)'s later years?
He began work on a manuscript chronicling his life exploring the continent, but this project was left unfinished when his sight failed him completely in 1851.
Did he have any other achievements?
In 1843 Thompson completed his atlas of the region from Hudson Bay to the Pacific Ocean.
What else is notable about this time?
He settled in nearby Terrebonne and worked on completing his great map, a summary of his lifetime of exploring and surveying the interior of North America.
Was this published?
Thompson's 1814 map, his greatest achievement, was so accurate that 100 years later it was still the basis for many of the maps issued by the Canadian government.
Did he receive any recognitions or awards?
In 1843 Thompson completed his atlas of the region from Hudson Bay to the Pacific Ocean.
What else is significant during this time?
Thompson returned to a life as a land owner, but soon financial misfortune would ruin him.
What happened after that?
By 1831 he was so deeply in debt he was forced to take up a position as a surveyor for the British American Land Company to provide for his family.
Did he get out of debt?
His luck continued to worsen and he was forced to move in with his daughter and son-in-law in 1845.
Where did he live?
In 1815, Thompson moved his family to Williamstown, Upper Canada.

Question: how long did he live there?
Self-contained rewrite: how long did David Thompson live in Williamstown?