Which U.S. state borders North Dakota to the south?

The state that borders North Dakota to the south is South Dakota. This geographical relationship is important as it outlines the boundaries of these two states, which share a significant amount of history and cultural connections due to their proximity. South Dakota is known for notable sites like the Badlands and Mount Rushmore, and its history is intertwined with that of North Dakota, particularly in terms of settlement patterns and indigenous cultures. The border between the two states is marked by the Missouri River, adding a natural landmark to their boundary.

In the context of the other states mentioned, Montana is located to the west of North Dakota, and Wyoming is further southwest. Minnesota lies to the east of North Dakota, making South Dakota the correct answer as it directly borders North Dakota to the south. Understanding these geographic relationships helps to contextualize North Dakota's place within the broader landscape of the United States.