In 1783, the Treaty of Paris was signed, which indicated the end of the American Revolution. The victory the American people achieved enabled them to establish an independent nation, and introduced a new era. From 1789 to 1865, the United States gradually formed its national identity and established its political and legal institution.
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【正确答案】 1、optimism and hope,    2、rebellious,    3、summit,    4、unworthy of,    5、complexity and diversity    
【答案解析】解析：(根据最后一段最后一句“American literature became mature and grew into complexity and diversity”可知，美国文学变得成熟、复杂而又多样。因此该空应填complexity and diversity。)