The people’s republic of china intervened in which nation to protect communism in asia? tibet korea cambodia vietnam

could you give me the options ?

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.