Comparison

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Because every portal follows the same fifteen-section outline, the comparison is genuinely like-for-like rather than a collage of whatever each government happens to publish.

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Comparison of selected legal systems
Attribute	TongaReviewed	ArgentinaReviewed
Legal family	Common law with customary law	Civil law
System of government	Constitutional monarchy	Federal presidential republic
Constitution	Act of Constitution of Tonga	Constitution of the Argentine Nation
In force since	1875	1853
Capital	Nuku'alofa	Buenos Aires
Official languages	Tongan, English	Spanish
Currency	Tongan paʻanga (TOP)	Argentine peso (ARS)
Population	105,000	46,000,000
Division of powers	Unitary. The Legislative Assembly legislates for the whole kingdom, and the island divisions of Tongatapu, Vava'u, Ha'apai, 'Eua and the Niuas are administrative districts headed by governors. Below that, town and district officers are elected under the Fakafekau'aki and District and Town Officers Act.	Federal. Twenty-three provinces plus the autonomous City of Buenos Aires retain all powers not delegated to the nation (Article 121). Substantive civil, commercial, criminal and labour law is federal and uniform, but each province legislates its own procedure and runs its own judiciary — an inversion of the United States allocation.
How law is made	Bills pass three readings in the Legislative Assembly and require the King's assent, which is a real rather than purely formal step. Ordinary bills need a simple majority. Amendments to the Constitution require a majority in the Assembly at three separate readings and the consent of the King and Privy Council, and clause 79 forbids any amendment affecting the law of liberty, the succession to the throne or the titles and hereditary estates of the nobles.	Bills may be introduced in either chamber, by the executive, or by citizen initiative. One chamber acts as chamber of origin and the other as revising chamber; insistence rules resolve disagreement. The President may veto in whole or in part, and Congress overrides with two-thirds of both chambers. Necessity-and-urgency decrees are permitted but excluded from criminal, tax, electoral and party matters, and must pass a bicameral committee.
Legal profession	Law practitioners are admitted by the Chief Justice and licensed under the Law Practitioners Act, with the Tonga Law Society as the professional body. Most qualify overseas or at the University of the South Pacific. A practitioner working on land must know the Land Act's allotment system rather than general property law, because the constitutional bar on selling land means conveyancing in the ordinary sense does not exist.	A five-to-six-year law degree followed by mandatory registration with a provincial or city bar association, which holds disciplinary power. The Colegio Público de Abogados de la Capital Federal governs practice in Buenos Aires. There is no separate bar examination; enrolment follows the degree. Notaries (escribanos) are a distinct numerus clausus profession with exclusive competence over real estate transfers.

A comparison table flattens nuance by design. Where a difference matters to a decision you are making, open both portals and read the section in full — the constitutional detail behind a one-line summary is often the part that governs the outcome.