This was the period after each world war which saw massive upheaval in the U.S. and fear of many foreigners. It was characterize
d by widespread fears of Communist influence on U.S. society and Communist infiltration of the U.S. government. Example: There was one in the United States following each of the World Wars.
The Harrison Land act took place on April 15, 1800. And was aimed towards giving people the right to buy land in the northwest territory. Hope this helps!