I continue to re-read the thread because it's an interesting challenge. I've planned to hike 40 miles but not 200.
I've only lately hiked as much as 14 miles in a day so I have a little sense of what it might take.

For Susan - note that the *survivors* of those ox trains moved so far and so fast. The non-survivors didn't. There were many non-survivors for various reasons.
The travelling parties also had the benefit of numbers and tools and skills and pre-planning (sometimes poorly) for the journey. They could hunt to supplement food and they chose their travelling season.

Teslinhiker- how many in your party? What ages/condition?
Your 2nd posting suggested that the real question was "how would you hike 200 miles?"

Was that the real question? Or was it more specific such as- 200 miles along the Fraser River from x to y in all seasons while accomodating a 3 and a 5 year old child without use of firearms for subsistence hunting? (or something like that)