Why might feelings and expressions of nationalism lead to war?

Nationalism is collective egotism. It causes wars for the same reasons that individual egotism causes conflict To use the old way of thinking about it, nationalism invokes the seven deadly sins on a collective level: Collective pride: that overweening sense that one's own group is superior.

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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.