This was the period after each world war which saw massive upheaval in the u. S. And fear of many foreigners. It was characterized by widespread fears of communist influence on u. S. Society and communist infiltration of the u. S. Government.

This period is known as the Red Scare.

Explanation:

The Red Scare, also known as McCarthyism, was the period in time in which fear of a possible communist or anarchist rise was spread. Its name derived from the red flags commonly used by communists.

This point in time rose fear of foreigners, fears of communist influence as well as infiltration within the U.S. government.

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.