To justify a war with mexico, president polk a. got mexico to strike first. b. bought california from mexico for a low price. c. refused to ask congress for a declaration of war. d. supported rancheros in new mexico.

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.