Political unrest, famine, lack of work, and religious persecution were the reasons why immigrants came to the united states during the second half of the nineteenth century true or false

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.