US Federalism (Edexcel A Level Politics): Revision Note

Exam code: 9PL0

Sarra Jenkins

Written by: Sarra Jenkins

Reviewed by: Steve Vorster

Updated on

The federal system of government

  • Federalism refers to the system of shared sovereignty in the USA, where power is divided between the federal (national) government and state governments, with each having authority over different policy areas

  • The federal government refers to the three branches of national government:

    • Congress

    • the President

    • the Supreme Court

Examiner Tips and Tricks

  • Federalism should not be confused with the federal government

  • Federalism describes the relationship between national and state governments

Constitutional basis of federalism

  • The powers of the federal government are enumerated in Articles I–III of the US Constitution

  • The powers of the states are protected by Amendment X, which states:

    • “The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.”

  • This creates a system in which:

    • both federal and state governments possess sovereignty

    • neither level can simply abolish the other

Venn diagram showing Federal and State powers. Federal: war, money, trade, post, forces, policy. State: elections, government, trade, powers. Both: taxes, laws, Constitution.
The distinction between federal and state powers

Federal government and the US states

  • Whilst federalism shares power between the federal and state governments, the vague nature of the US Constitution has resulted in disputes over where power should lie

Federal vs state power in practice

How the federal government has more power

How state governments have more power

  • Gains supremacy under Article VI of the US Constitution

  • Article VI states that “This Constitution, and the Laws of the United States…shall be the supreme Law of the Land”

  • Control key domestic policy areas such as education, policing and elections

  • After Dobbs v Jackson (2022), power over abortion laws was returned to the states

    • Texas passed highly restrictive abortion laws, while California expanded access and protected abortion rights in its state constitution

  • When conflicts occur between national and state law, federal law overrides state law

  • Arizona v United States (2012) confirmed federal supremacy over immigration enforcement

  • States administer federal elections, allowing them to shape voting rules

    • Georgia’s Election Integrity Act (2021) altered voting access despite federal criticism

  • Controls national finances, allowing it to influence state policy through funding

    • Biden’s American Rescue Plan (2021) attached funding conditions to COVID-19 relief

  • States draw congressional district boundaries, leading to gerrymandering controversies in Texas and California (2024–25)

  • Controls foreign policy and national defence

  • States can challenge federal authority in the Supreme Court

    • In Biden v Nebraska (2023), Republican-led states successfully blocked student loan forgiveness

  • States cannot negotiate treaties or maintain armed forces

    • Ukraine aid packages (2022–24) were passed regardless of state opposition

  • State powers are protected by Amendment X of the Constitution

Overall evaluation of federalism

  • Federalism can be considered effective because:

    • it allows states to reflect local values

    • it limits the concentration of power at the national level

  • However, federalism can also be considered ineffective because:

    • it creates inequality between states

    • citizens’ rights can vary significantly depending on where they live

  • Although the federal government dominates funding and is constitutionally supreme in law (Article VI):

    • states retain significant autonomy

    • state powers are protected by Amendment X

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Sarra Jenkins

Author: Sarra Jenkins

Expertise: Content Writer

Sarra is a highly experienced A-Level Politics educator with over two decades of teaching and examining experience. She was part of the team that wrote the Edexcel 2017 Politics Specification and currently works as a Senior Examiner. A published author of 14 textbooks and revision guides, her expertise lies in UK and US politics, exam skills, and career guidance. She continues to teach, driven by her passion for this "evolving and dynamic subject".

Steve Vorster

Reviewer: Steve Vorster

Expertise: Economics & Business Subject Lead

Steve has taught A Level, GCSE, IGCSE Business and Economics - as well as IBDP Economics and Business Management. He is an IBDP Examiner and IGCSE textbook author. His students regularly achieve 90-100% in their final exams. Steve has been the Assistant Head of Sixth Form for a school in Devon, and Head of Economics at the world's largest International school in Singapore. He loves to create resources which speed up student learning and are easily accessible by all.