Which of the following best summarizes the lewis and clark expedition?

it explored the louisiana territory for a year before harsh weather forced it to return to the east.
it lasted six months and laid the groundwork for settlement along the mississippi river.
it covered about eight thousand miles, mapping the louisiana territory and strengthening us claims to oregon.
it covered about eight thousand miles in its search for a northwest passage, which it eventually discovered.

ok from the research i have gathered i can at least say that summary 1, 2, and 4 are wrong. this is because the lewis and clark expedition lasted for like two years. not six months nor just 1 year. they also explored the western side of america to get a better look over of what  the western side looked like. so leaving the last option left, the correct answer that i can see is summary 3. i hope this helped katiebutt62.

it further strained relations between the north and the south and convinced

i believe it would be capitalism