Communism ended in eastern europe because would no longer support it with military force.

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.

the french revolution was when many people were persecuted for disagreeing or making separate government