---
title: "Australia: Federal Parliamentary Monarchy | Model Diplomat"
description: "Australia is a federal parliamentary constitutional monarchy and a key US treaty ally in the Indo-Pacific, crucial for global diplomacy."
url: "https://modeldiplomat.com/learn/glossary/australia"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Australia is a federal parliamentary constitutional monarchy in the Southern Hemisphere, a Commonwealth realm and US treaty ally central to the Indo-Pacific order.
- What is the constitutional basis of Australian federation and full sovereignty?
- How is the Australian Constitution amended?
- What security arrangements anchor Australia's foreign policy?
- Why is the Australian Senate significant in comparative government?

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