Australian Citizenship Test 2022: What year did the seperate colonies unite into a federation of states? What was that called and what was established?

Question

What year did the seperate colonies unite into a federation of states? What was that called and what was established?

Mary Woods · Accepted Answer

The Commonwealth of Australia in 1901, the high court was established under the new Australia constitution

What year did the seperate colonies unite into a federation of states? What was that called and what was established?