What group explored the Louisiana Territory and lands west?

The group Lewis and Clark.

Explanation:

Lewis and Clark Expedition explored the Louisiana Territory. It included Capt. Meriwether Lewis and Lieut. William Clark, as well as Sacagawea, she helped them and gathered things like food and other needed resources. :)

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.