What historical figure is associated with the exploration of caves in Minnesota?

The association of John O. G. Haines with the exploration of caves in Minnesota is well-founded due to his significant contributions to the study and documentation of the state's caves during the late 19th and early 20th centuries. Haines was instrumental in the exploration and promotion of caves, notably Niagara Cave, highlighting their geological features and the recreational potential for tourism. His work helped to raise awareness of Minnesota’s natural wonders and played a critical role in the preservation of these geological sites as points of interest for both locals and visitors.

In contrast, while Lewis and Clark are renowned explorers of the American West, their focus was not specifically on caves in Minnesota. Similarly, Henry Hudson is noted for his explorations in northeastern North America, particularly around Canada, with no direct ties to Minnesota’s cave systems. Daniel Boone is primarily recognized for his exploration and settlement in Kentucky and surrounding areas, which likewise excludes any notable involvement with Minnesota caves. Haines' targeted efforts in this region make him the correct association for the exploration of caves in Minnesota.