What led to genocide in Cambodia? -The war in Vietnam complicated politics in Cambodia, and a civil war ensued.
-Khmer Rouge took over Cambodia and persecuted its enemies.
-Educated Cambodians attempted a government takeover from Khmer Rouge.
-Massacres increased because reeducation camps were failing.

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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.