Which has practiced isolationism?

The United States

Explanation:

"American Isolationism While it has been practiced to some degree in U.S. foreign policy since before the War for Independence, isolationism in the United States has never been about a total avoidance of the rest of the world. Only a handful of American isolationists advocated the complete removal of the nation from the world stage." Based on that I'm pretty sure it's the United States.

answer: an oligarchy is a political system in which the government is run by a group of noble families, or the elite wealthy members of a society. a present day oligarchic government is iran.

explanation:

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.