It's difficult to say definitively which state has the *most* limestone, as there are many factors to consider like the depth of the deposits, the quality of the limestone, and how much is actually extracted. However, Missouri is often considered to have the largest deposits of limestone in the United States.

Missouri's vast deposits of limestone have been instrumental in the state's economy and history. The limestone is used in various industries, including construction, agriculture, and manufacturing. It is also a key component in the formation of Missouri's iconic karst topography, which features caves, sinkholes, and springs.

Here are some other states with significant limestone deposits:

* Kentucky: Home to the Mammoth Cave National Park, which boasts the longest known cave system in the world.

* Alabama: Has extensive limestone deposits used for cement production and other purposes.

* Florida: The state's geology features significant limestone formations, contributing to its unique natural landscape.

* Texas: Has vast limestone deposits used for construction, agriculture, and the oil and gas industry.

Keep in mind that these are just a few examples, and other states may have equally significant limestone deposits depending on how you define "most."