Bicameralism

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Bicameralism is the division of a legislature into two separate assemblies, known as chambers or houses; such a legislature is called bicameral. Bicameralism is distinguished from unicameralism, in which all members deliberate and vote as a single group. As of 2022, roughly 40% of the world's national legislatures are bicameral, while unicameralism represents 60% nationally and much more at the subnational level. Since the 1970s, the number of bicameral legislatures has increased significantly, following a period of decline in the early 20th century. Often, the members of the two chambers are elected or selected by different methods, which vary from jurisdiction to jurisdiction. This can often lead to the two chambers having very different compositions of members. Enactment of primary legislation often requires a concurrent majority—the approval of a majority of members in each of the chambers of the legislature. When this is the case, the legislature may be called an example of perfect...

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