导致美国两党制的一个原因是，每个国会议员选区只能选出一名代表。
One factor contributing to the two-party system in the United States is the single-member district system of electing Representatives.
这个时期也是美国两党制形成、对外经济扩张和领土扩张的重要时期。
It was the period of the establishment of the two-party system and the key period of economic and territorial expansion of the country.
这个时期也是美国两党制形成、对外经济扩张和领土扩张的重要时期。
It was the period of the establishment of the two-party system and the key period of economic and territorial expansion of the country.
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