The us supreme court has interpreted the amendment to extend many national constitutional guarantees to the states

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

there has only been 12 presidents. the 12th president is/was moon jae-in