In U. S. History, 19th Century use of the term "American Frontier" refers to A)
the area where pioneer settlement ended.
 
B)
the Atlantic or Pacific coast of North America.
 
C)
the territory east of the Appalachian Mountains.
 
D)
any territory beyond the thirteen original colonies.
 

Enlightenment thinkers most contributed to the development of whichpolitical idea? a. religious leaders should play the largest role in establishing asociety's laws.b. democratic governments have the responsibility to protect humanrights.c. criminals must be punished harshly if a society is to maintainorder.d. written constitutions place unnecessary restrictions ongovernments' powers.