What were the key influences on western cultural developments in the mid-20th century?

The post-war boom led to led to economic wealth and freedom during this period where opportunities were plentiful and people were now more adventurous.  This led to new changes in attitudes and ideas.  Women were now striving to be more independent and minorities clamored for more equality.  As time went by more people started to come with their own views on society where they wanted to have more freedom to do what they want and be what they want. 

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.