One factor contributing to the two-party system in the United States is the single-member district system of electing Representatives.
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。
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Under 1993 legislation, Italy has single-member districts for 75% of the seats in parliament; the remaining 25% of seats are allotted on a proportional basis.