4. The success of the EU was based MOSTLY on which of these?
defeating communism
eliminating trade barriers
exploring new production methods
controlling members' governments

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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.