Did Pierre la verendrye travel by ship?
yes he did
No one specific person is credited with "finding" South Dakota. There have been people living in South Dakota for several thousand years. The "Mound Builders", the Arikara, and the Sioux were living in South Dakota before Europeans came to the area. The Verendrye brothers, probably Louis-Joseph Gaultier de La Verendrye and Francois de La Verendrye, are the first known Europeans to travel through what is now South Dakota.