单项选择题

The primary purpose of this passage is to ______.

A．criticize the belief of manifest destiny
B．justify American westward expansion
C．explain why Americans expanded westwards
D．explain Americans' racism

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单项选择题

It can be inferred from the passage that ______.

A．slavery in the South was an evidence of American's racism
B．Indians were driven out of their homes into the west
C．Americans were threatened by wars during 1840s
D．Americans won their independence through westward expansion