The correct answer is B: Immigration was based on the national origins quota system. The National Origins Act was a United States federal law that set the amount of immigrants from certain countries that were allowed to enter the U.S. Admission to the U.S was determined by ethnic identity and national origin. It reduced the number of southern and eastern Europeans and excluded Asians entering the country.
the reason for this is many loyalist were southerns so Patriots and loyalist did fight eachother. That being said a lot of the war was guerrilla war & battles with standing armies.