📚 US Government and Politics: The Constitution, Federalism, Congress, Presidency and Supreme Court | 美国政府与政治：宪法、联邦制、国会、总统与最高法院
The US political system is built on a codified constitution, a federal division of power, a bicameral Congress, a separately elected presidency and an independent Supreme Court. For Edexcel A-Level Politics Component 3, you need to understand the formal structures, the informal practices and the key debates that shape American government. This revision article covers the core content of Part 1: Government and Politics of the USA, using accessible English and paired Chinese explanations.
美国政治体系建立在成文宪法、联邦制分权、两院制国会、独立选举的总统和独立的最高法院之上。在爱德思A-Level政治第三单元中，你需要理解塑造美国政府的正式结构、非正式惯例以及关键辩论。本篇复习文章涵盖第一部分“美国政府与政治”的核心内容，采用简明英文与配对中文讲解。
1. The US Constitution and its core principles | 美国宪法及其核心原则
The US Constitution, drafted in 1787 and effective from 1789, creates a federal republic based on popular sovereignty, limited government, separation of powers, checks and balances, and federalism. It replaced the weak Articles of Confederation, which had left the national government unable to tax or regulate commerce effectively.
美国宪法于1787年起草、1789年生效，建立了一个以人民主权、有限政府、三权分立、制衡和联邦制为基础的联邦共和国。它取代了软弱的《邦联条例》，该条例使国家政府无法有效征税或管理贸易。
The principle of separation of powers assigns legislative, executive and judicial power to Congress, the presidency and the Supreme Court respectively. Checks and balances then gives each branch tools to restrain the others, such as the presidential veto, congressional override and judicial review.
三权分立原则将立法权、行政权和司法权分别赋予国会、总统和最高法院。制衡机制则赋予每个部门限制其他部门的工具，例如总统否决权、国会推翻否决以及司法审查。
2. Codified constitution, enumerated and implied powers | 成文宪法、列举权力与默示权力
The US Constitution is a codified document with seven articles and 27 amendments. Article I lists the enumerated powers of Congress, including taxation, regulation of interstate commerce, coining money and declaring war. The necessary and proper clause, often called the elastic clause, gives Congress implied powers beyond those explicitly listed.
美国宪法是一部成文法典，共7条正文和27条修正案。第一条列举了国会的权力，包括征税、管理州际贸易、铸造货币和宣战。必要和适当条款，通常称为弹性条款，赋予国会超出明文列举的默示权力。
The supremacy clause in Article VI makes the Constitution and federal laws the ‘supreme law of the land’, overriding state laws in any conflict. This has been central to the expansion of federal authority, especially through the commerce clause and the Fourteenth Amendment.
第六条中的最高条款规定宪法和联邦法律是国家的最高法律，在冲突时优先于州法律。这一直是联邦权力扩张的核心，尤其是通过贸易条款和第十四修正案。
3. Federalism: dual, cooperative and new federalism | 联邦制：二元、合作与新联邦主义
US federalism divides sovereignty between the national government and the 50 states. Dual federalism describes a layer-cake model in which national and state responsibilities are clearly separated, while cooperative federalism describes a marble-cake model of shared functions, grants and intergovernmental cooperation.
美国联邦制在联邦政府与50个州之间划分主权。二元联邦制是一种分层蛋糕模式，联邦与州职责明确分离；合作联邦制则是一种大理石花纹蛋糕模式，职能共享、使用拨款并进行政府间合作。
Since the 1970s, new federalism has sought to return power to the states through block grants, devolution and welfare reform. However, federal mandates, conditions attached to funding and national crises such as the COVID-19 pandemic continue to strengthen the national government.
自20世纪70年代以来，新联邦主义试图通过整笔拨款、权力下放和福利改革将权力归还给州。然而，联邦指令、拨款附加条件以及新冠疫情等全国性危机仍在加强联邦政府。
4. Congress: structure, representation and powers | 国会：结构、代表与权力
Congress is bicameral. The House of Representatives has 435 members elected every two years from single-member districts, with seats apportioned by state population. The Senate has 100 members, two per state, elected for six-year terms, with one-third elected every two years.
国会实行两院制。众议院有435名议员，每两年从单一选区选举产生，席位按州人口分配。参议院有100名议员，每州2名，任期六年，每两年改选三分之一。
| Feature | 特征 | House of Representatives | 众议院 | Senate | 参议院 |
|---|---|---|
| Membership | 人数 | 435 | 435名 | 100 | 100名 |
| Term length | 任期 | 2 years | 2年 | 6 years | 6年 |
| Exclusive powers | 专属权力 | Revenue bills, impeachment | 税收法案、弹劾 | Confirm appointments, ratify treaties, try impeachments | 批准任命、批准条约、审理弹劾案 |
The House initiates revenue bills and votes to impeach federal officers, while the Senate confirms appointments and treaties and tries impeachments. Both chambers must pass identical legislation before it can be sent to the president.
众议院发起税收法案并投票弹劾联邦官员，参议院批准任命和条约并审理弹劾案。两院必须通过完全相同的法案才能送交总统。
5. Legislative process and the role of committees | 立法过程与委员会的作用
Bills pass through committee hearings, mark-up, floor debate, conference committee and presidential action. Most bills die in committee, and the Senate filibuster requires 60 votes to end debate on most legislation, giving the minority party considerable influence.
法案需经过委员会听证、修改、全院辩论、两院协商委员会和总统签署。大多数法案在委员会夭折，参议院的冗长辩论通常需要60票才能结束，这赋予少数党相当大的影响力。
Party leaders such as the Speaker of the House and the Senate majority leader control the agenda. Powerful standing committees and their chairs shape legislation through hearings, amendments and gatekeeping, while the rules committee in the House sets the terms of debate.
政党领袖，如众议院议长和参议院多数党领袖，控制议程。强大的常设委员会及其主席通过听证、修正案和把关来塑造立法，而众议院的规则委员会设定辩论条件。
6. The presidency: roles, powers and the executive branch | 总统：角色、权力与行政部门
The president is head of state, head of government and commander-in-chief. Formal powers include vetoing legislation, negotiating treaties, issuing executive orders, appointing federal judges and officials, and granting pardons for federal offences.
总统兼任国家元首、政府首脑和三军统帅。正式权力包括否决法案、谈判条约、发布行政命令、任命联邦法官和官员以及赦免联邦罪行。
Presidential power has grown through what critics call the imperial presidency. Presidents increasingly use executive agreements instead of treaties, issue executive orders to bypass Congress, and authorise military action without formal declarations of war, while Congress retains the power of the purse and impeachment.
总统权力通过批评者所称的帝王式总统而扩张。总统越来越多地使用行政协定而非条约，发布行政命令绕过国会，并在未经正式宣战的情况下授权军事行动，而国会保留财政权和弹劾权。
7. Checks and balances in practice | 权力制衡的实践
Each branch can limit the others. Congress can override a presidential veto by a two-thirds vote in both chambers, reject appointments and treaties, and impeach and remove federal officers. The president can veto legislation. The Supreme Court can declare laws or executive actions unconstitutional.
每个部门都能限制其他部门。国会两院可以以三分之二多数推翻总统否决、拒绝任命和条约并弹劾和罢免联邦官员。总统可否决法案。最高法院可宣布法律或行政行为违宪。
Divided government, when the White House and Congress are controlled by different parties, often intensifies gridlock and makes compromise difficult. However, unified government does not guarantee presidential success, as internal party divisions and Senate rules such as the filibuster can still block legislation.
白宫与国会由不同党派控制时的分裂政府往往加剧僵局，使妥协更加困难。然而，统一政府并不保证总统的立法成功，因为党内分歧和参议院规则（如冗长辩论）仍可能阻碍立法。
8. The Supreme Court and judicial review | 最高法院与司法审查
The Supreme Court consists of nine justices appointed by the president and confirmed by the Senate, serving for life ‘during good behaviour’. It has both original and appellate jurisdiction and exercises judicial review, the power to strike down laws that violate the Constitution.
最高法院由9名大法官组成，由总统提名并经参议院确认，终身任职。它拥有初审管辖权和上诉管辖权，并行使司法审查权，即废除违反宪法的法律的权力。
Judicial review was established in Marbury v Madison (1803), making the Court a powerful policy actor. Justices differ between judicial activism and judicial restraint, and between originalism and living constitution approaches. Landmark cases such as Brown v Board (1954), Roe v Wade (1973) and Dobbs v Jackson (2022) illustrate the Court’s ideological impact.
司法审查由马伯里诉麦迪逊案（1803）确立，使法院成为强大的政策行为者。大法官在司法能动与司法克制、原旨主义与活的宪法之间存有分歧。布朗诉教育委员会案（1954）、罗诉韦德案（1973）和多布斯诉杰克逊案（2022）等里程碑案件体现了法院的意识形态影响。
9. Civil rights and liberties | 民权与公民自由
The Bill of Rights protects civil liberties such as freedom of speech, religion and the press, due process, and protection against unreasonable searches. The Fourteenth Amendment extends due process and equal protection to the states, allowing the federal courts to apply most Bill of Rights protections against state governments.
《权利法案》保护言论自由、宗教自由、新闻自由、正当程序以及免受不合理搜查等公民自由。第十四修正案将正当程序和平等保护扩展到各州，使联邦法院能够将大部分《权利法案》保护适用于州政府。
Civil rights movements have used the equal protection clause and federal legislation, such as the Civil Rights Act 1964 and Voting Rights Act 1965, to combat racial discrimination and secure voting rights. Tensions persist over affirmative action, abortion, gun rights under the Second Amendment, and LGBTQ+ equality, with the Supreme Court frequently acting as the final arbiter.
民权运动利用平等保护条款和联邦立法（如1964年《民权法案》和1965年《投票权法案》）打击种族歧视并保障投票权。关于平权行动、堕胎、第二修正案持枪权以及LGBTQ+平等等问题持续紧张，最高法院经常充当最终裁决者。
10. Elections, participation and the Electoral College | 选举、参与与选举人团
The US uses a federal electoral system. Presidential elections are decided by the Electoral College, in which each state receives electors equal to its congressional delegation. Most states award all electors on a winner-take-all basis, which can produce a president who loses the national popular vote, as in 2000 and 2016.
美国采用联邦选举制度。总统选举由选举人团决定，每个州获得与其国会代表团人数相等的选举人票。大多数州采用胜者全得规则，这可能产生在全国普选票中落败却当选的总统，如2000年和2016年。
Congressional elections face issues of gerrymandering, incumbency advantage and low midterm turnout. Campaign finance remains controversial after Citizens United v FEC (2010), which allowed unlimited independent spending by corporations and unions through Super PACs, raising concerns about money in politics and unequal participation.
国会选举面临选区不公正划分、在职者优势以及中期选举投票率低等问题。在联合公民诉联邦选举委员会案（2010）之后，竞选资金仍然存在争议，该案允许公司和工会通过超级政治行动委员会进行无限制的独立开支，引发对金钱政治和参与不平等的担忧。
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