Why is Australia a part of the commonwealth?

Hi Caylia, thanks for your interesting question! 

The Commonwealth of nations is a collection of countries and territories who are connected through shared values and often have historical ties to the British Empire.

While Aboriginal and Torres Strait Islander peoples have lived on these lands for at least 60 000 years, in the late 1700s James Cook claimed the continent as part of the British Empire. British colonies were established in 1788 and on 1 January 1901 these colonies united to become the nation of Australia. This event is known as Federation and resulted in the creation of Australia as a constitutional monarchy with the monarch as our Head of State.  

As Australia’s history is closely tied to Britain we have chosen to maintain our membership of the Commonwealth to the present-day.

A painting of a man wearing a formal hat and uniform standing and speaking to a large crowd inside a large building. The painting shows many people on stage behind the man, and many more people standing in front of the stage watching him.

Opening of the First Parliament of the Commonwealth of Australia by H.R.H. The Duke of Cornwall and York (Later King George V), May 9, 1901.

Parliament House Art Collection, Canberra, ACT and the Royal Collection Trust.

Opening of the First Parliament of the Commonwealth of Australia by H.R.H. The Duke of Cornwall and York (Later King George V), May 9, 1901.

A painting of a man wearing a formal hat and uniform standing and speaking to a large crowd inside a large building. The painting shows many people on stage behind the man, and many more people standing in front of the stage watching him.

Parliament House Art Collection, Canberra, ACT and the Royal Collection Trust.

Description

This painting was painted by Australian artist Tom Roberts. It is known as the 'Big Picture', although its official name is 'Opening of the First Parliament of the Commonwealth of Australia by H.R.H. The Duke of Cornwall and York (Later King George V), May 9, 1901.' 

The ‘Big Picture’ includes 269 portraits of the people who attended the opening of the First Parliament, including the Governor-General, the members of the Senate and House of Representatives, and Australia’s first Prime Minister, Edmund Barton.