Missouri constitution
Article III: legislative department
Section 43

The general assembly shall never interfere
with the primary disposal of the soil by the United States, nor with any regulation
which Congress may find necessary for securing the title in such soil to bona fide purchasers.
No tax shall be imposed on lands the property of the United States; nor shall
lands belonging to persons residing without the state ever be taxed at a higher rate than
lands belonging to persons residing within the state.