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A bicameral legislature is one in which the legislators are divided into two separate assemblies, chambers or houses. Bicameralism is distinguished from unicameralism, in which all of the members deliberate and vote as a single group, and from some legislatures which have three or more separate assemblies, chambers or houses. As of 2015, most national legislatures are not bicameral. Often, the members of the two chambers are elected or selected using different methods, which vary from country to country. Enactment of primary legislation often requires a concurrent majority, the approval of a majority of members in each of the chambers of the legislature. However, in many Westminster system parliaments, the house to which the executive is responsible can overrule the other house. Bicameralism is an essential and defining feature of the classical notion of mixed government. ==Theory of bicameral congress== Although the ideas on which bicameralism are based can be traced back to the theories developed in ancient Sumer and later ancient Greece, ancient India, and Rome, recognizable bicameral institutions first arose in Medieval Europe where it was associated with separate representation of different estates of the realm. For example, one house would represent the aristocracy, and the other would represent the commoners.〔(The Constitutional Background - House of Representatives archives )〕 The Founding Fathers of the United States also favoured a bicameral legislature. The idea was to have the Senate be wealthier and wiser. Benjamin Rush saw this though, and noted that, "this type of dominion is almost always connected with opulence." The Senate was created to be a stabilising force, elected not by mass electors, but selected by the State legislators. Senators would be more knowledgeable and more deliberate—a sort of republican nobility—and a counter to what Madison saw as the "fickleness and passion" that could absorb the House.〔 He noted further that the "use of the Senate is to consist in its proceeding with more coolness, with more system and with more wisdom, than the popular branch". Madison's argument led the Framers to grant the Senate prerogatives in foreign policy, an area where steadiness, discretion, and caution were deemed especially important".〔 The Senate was chosen by state legislators, and senators had to possess a significant amount of property in order to be deemed worthy and sensible enough for the position. In fact, it was not until the year 1913 that the 17th Amendment was passed, which "mandated that Senators would be elected by popular vote rather than chosen by the State legislatures".〔 As part of the Great Compromise, they invented a new rationale for bicameralism in which the Senate would have states represented equally, and the House would have them represented by population. In subsequent constitution making, federal states have often adopted bicameralism, and the solution remains popular when regional differences or sensitivities require more explicit representation, with the second chamber representing the constituent states. Nevertheless, the older justification for second chambers—providing opportunities for second thoughts about legislation—has survived. Growing awareness of the complexity of the notion of representation and the multifunctional nature of modern legislatures may be affording incipient new rationales for second chambers, though these do generally remain contested institutions in ways that first chambers are not. An example of political controversy regarding a second chamber has been the debate over the powers of the Canadian Senate or the election of the Senate of France.〔 (Liberation.fr ), Sénat, le triomphe de l'anomalie〕 The relationship between the two chambers varies; in some cases, they have equal power, while in others, one chamber is clearly superior in its powers. The first tends to be the case in federal systems and those with presidential governments. The latter tends to be the case in unitary states with parliamentary systems. There are two streams of thought: Critics believe bicameralism makes meaningful political reforms more difficult to achieve and increases the risk of gridlock—particularly in cases where both chambers have similar powers—while proponents argue the merits of the "checks and balances" provided by the bicameral model, which they believe help prevent the passage into law of ill-considered legislation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bicameralism」の詳細全文を読む スポンサード リンク
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