Explain white supremacy :

White supremacy is the belief that white people constitute a superior race and should therefore dominate society, typically to the exclusion or detriment of other racial and ethnic groups, in particular black or Jewish people.

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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.