Background: why split power at all?
In England, John Locke's Second Treatise of Government (1689) separated legislative and executive power. Then in France, Montesquieu's The Spirit of the Laws (1748) delivered the knockout version.
Fun twist: Montesquieu's model was England. Which, with its parliamentary system, didn't actually separate power that cleanly.
The case for it: the U.S. Constitution buys in
The 1787 Constitution literally splits power by article: Article I (Congress), Article II (President), Article III (courts). And James Madison, arguing for ratification in The Federalist, explained why.
- No. 47: putting legislative, executive, and judicial power in the same hands "may justly be pronounced the very definition of tyranny."
- No. 51: "Ambition must be made to counteract ambition." "If men were angels, no government would be necessary."
Read the full text via the Library of Congress.
Law is hard because "how far does this power go?" can't be settled just by reading the text. You need lawyers and courts to call it every time the boundaries actually collide. In 1952, a wartime President tried to walk straight across one of those lines.
The ruling: Truman seizes the steel mills
- Citation
- Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952)
- Vote
- 6–3 against the President
- Facts
- During the Korean War, facing a steel strike, President Truman seized the steel mills by executive order with no statute authorizing it
- Core
- The President executes the law; he can't make it
Justice Robert Jackson's concurrence is actually more famous than the majority. He sorted presidential power into three zones:
- Acting with Congress's authorization → power at its maximum
- Congress silent → a "zone of twilight"
- Acting against Congress's will → power at its lowest ebb
Truman's seizure fell into zone three. Read it on Justia.
How Korea's Constitution does it
| Power | Korean Constitution | Key check |
|---|---|---|
| Legislative | Art. 40 (National Assembly) | Presidential request for reconsideration (veto, Art. 53) |
| Executive | Art. 66(4) (Executive Branch) | Parliamentary inspections; impeachment motions |
| Judicial | Art. 101 (courts) + Art. 111 (Constitutional Court) | Constitutional review; competence disputes |
Korea is presidential, but it mixes in parliamentary features like a Prime Minister and State Council, so the lines aren't as sharp as in the U.S. That difference shows up on exams a lot.
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Criticism and debate
- Gridlock: if every branch can block every other, sometimes nothing gets decided.
- The administrative state: agencies write binding rules under delegated power, which is legislating in all but name. The Supreme Court's 2024 Loper Bright decision, which overruled Chevron deference to agency interpretations, is part of this same fight.
- The legislative veto: in INS v. Chadha (462 U.S. 919, 1983), the Court struck down Congress's practice of overriding executive decisions by a one-house resolution. Even checks have to follow the proper process.
Separation of powers doesn't try to pick who's right. It makes sure nobody can go all the way alone. Read the news through that lens and words like veto, impeachment, and constitutional review suddenly snap into one story. Here's how to frame it in a paper.
Study notes
- History of ideas (Korean material): 하나의 유기체로서의 법: 몽테스키외 법의 정신 인상 깊은 구절과 독후감, 삼권분립과 오늘의 법 is a close reading of The Spirit of the Laws that ties original passages to today's law. Nice model for your own paper.
- Applied problems (Korean material): Critique of a Hypothetical Case on the Structure of Government: Presidential Veto During Recess, Veto on Policy Grounds, and Promulgation and Entry into Force of Statutes works through a hypothetical about the presidential veto, showing how these checks turn into an actual exam answer.
- Connected ideas: splitting power only matters if everyone stays under the law. That's the rule of law. And the moment courts became the referee traces back to Marbury v. Madison.
References and official sources
- Montesquieu, The Spirit of the Laws (1748); John Locke, Second Treatise of Government (1689).
- The Federalist No. 47 and No. 51 (1788). Library of Congress
- Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952). Justia
- INS v. Chadha, 462 U.S. 919 (1983).
- Loper Bright Enterprises v. Raimondo, No. 22-451 (U.S. June 28, 2024).
- Constitution of the Republic of Korea, Arts. 40, 53, 66, 101, 111. law.go.kr