How is the political system of the USA, a major world power, organised, and how do its citizens take part?
The political system of the USA: the Constitution, the separation of powers between the President, Congress and Supreme Court, the two main parties, and how citizens participate.
The political system of the USA for SQA National 5 Modern Studies (world power option): the Constitution and separation of powers between the President, Congress and Supreme Court, the federal system, the two main parties, elections and how citizens participate, with worked exam answers.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
This dot point sits in Section 3 of the SQA National 5 Modern Studies question paper, International Issues. Candidates choose between studying a world power (such as the USA) or a world issue. This page covers the political system of the USA, the most commonly studied world power: how it is governed, the separation of powers, the party system and how citizens take part.
The key skill is describing the features of the system and how participation works. It links directly to the socio-economic issues of the USA and to its international influence.
The answer
The USA is a federal democratic republic governed under a written Constitution. The Constitution sets out how power is divided and protects citizens' rights through amendments such as the Bill of Rights.
The separation of powers
A central feature is the separation of powers into three branches, each able to check and balance the others:
- The executive - the President, who is head of state and government, runs the country, commands the armed forces and can veto laws.
- The legislature - Congress, which makes laws. It has two houses: the House of Representatives and the Senate.
- The judiciary - the Supreme Court, which interprets the Constitution and can rule laws or actions unconstitutional.
This system means no single branch can dominate: Congress passes laws but the President can veto them; the President acts but Congress controls money and can impeach; the Supreme Court can strike down laws.
The federal system
The USA is a federal state: power is shared between the federal (national) government in Washington and the 50 states, each with its own government and laws. Some matters are decided nationally; others are left to the states, so laws can differ from state to state.
The two-party system
US politics is dominated by two main parties: the Democrats and the Republicans. Almost all major offices, including the presidency and most of Congress, are held by one of these two parties, so US elections are largely a contest between them.
Elections and participation
US citizens participate in several ways:
- Voting in elections for President (every four years), Congress, and state and local offices.
- Joining or supporting a party or campaign, donating, volunteering and campaigning.
- Joining interest groups that lobby on issues.
- Standing for office themselves.
Why the structure matters
The separation of powers and federalism are designed to limit government power and protect liberty, reflecting the USA's founding. The two-party system shapes elections and policy. Participation matters because, as in any democracy, it is how citizens influence who governs. Describe questions reward accurate detail on these features rather than vague generalisations.
Examples in context
If a source describes the President vetoing a law passed by Congress, that illustrates checks and balances. If a source describes a state passing a law different from its neighbour, that shows federalism. If a source describes a presidential election between a Democrat and a Republican, that shows the two-party system. Matching the example to the feature is the exam skill.
Try this
Q1. Name the three branches of the US government. [3 marks]
- What the marker wants. The executive (President), the legislature (Congress), and the judiciary (Supreme Court).
Q2. Name the two main political parties in the USA. [2 marks]
- What the marker wants. The Democrats and the Republicans.
Q3. Explain what is meant by checks and balances. [3 marks]
- What the marker wants. Each branch can limit the others, for example the President can veto laws Congress passes and the Supreme Court can rule laws unconstitutional, so no branch becomes too powerful.
A note on sources
This guide is AI-written and not individually human-reviewed. The features of the US system follow the published SQA National 5 Modern Studies course specification; verify current details and paper structure against the specification at sqa.org.uk.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style6 marksDescribe, in detail, two features of the political system of a world power you have studied. (6 marks)Show worked answer →
A knowledge (describe) question for the USA. The marker awards up to 3 marks per feature: identify it and develop it with accurate detail.
Feature one: the separation of powers. Power is split between three branches, the President (executive), Congress (legislature) and the Supreme Court (judiciary), so each can check the others, preventing any one branch becoming too powerful. Feature two: a two-party system. Two main parties, the Democrats and the Republicans, dominate elections, so almost all major elected offices, including the presidency and most of Congress, are held by one of these two parties.
Each feature needs naming plus development. Two named features with no detail would stay low; two developed features reach 6.
SQA N5 style6 marksDescribe, in detail, two ways citizens of a world power can participate in politics. (6 marks)Show worked answer →
A describe question for the USA. The marker awards up to 3 marks per way: identify it and develop it.
Way one: voting. US citizens can vote in elections for President every four years, for Congress, and for state and local offices, so they choose their representatives at several levels. Way two: joining or supporting a party or campaign. Citizens can join the Democrats or Republicans, donate money, volunteer and campaign, or join interest groups, so they can influence policy and candidates between and during elections.
Each way needs naming plus development. Two named ways with no detail would stay low; two developed ways reach 6.
Related dot points
- Socio-economic issues in the USA: inequalities in wealth and income, health, education, employment, housing and crime affecting different groups, and government responses to them.
Socio-economic issues in the USA for SQA National 5 Modern Studies (world power option): inequalities in wealth and income, health, education, employment and housing affecting different groups, the causes and effects, and government responses such as welfare and healthcare reform, with worked exam answers.
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The international influence of the USA for SQA National 5 Modern Studies (world power option): how the USA uses military strength, economic power, political leadership in bodies such as the UN and NATO, and cultural influence to shape global affairs, with worked exam answers.
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