South Dakota is about 3 times smaller than Kenya.

Kenya is approximately 580,367 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 33.86% the size of Kenya. Meanwhile, the population of Kenya is ~55.9 million people (55.1 million fewer people live in South Dakota).
Tip: This to-scale comparison of Kenya vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles.