Great Britain is the big island of the UK which contains England, Scotland, and Wales. The United Kingdom is Great Britain plus the six counties of Northern Ireland, The Isle of Man, and (I think) some of the islands in the English Channel.

A Briton is a person from Britain.

IDK, man. Canada be weird sometimes.

Yes, it’s its own country.

Canada, along with Australia and a bunch of other former colonies, belong to what’s known as the Commonwealth, of which the British monarch is the head. It’s basically an association of countries that used to be ruled by Britain, but Britain no longer has a say in their laws or how they’re governed.

Australia didn’t have a revolution. Australian independence was a long process that lasted from 1901 to 1986. You may want to check the “The steps to full sovereignty” section of the “History of Australia” wikipedia article.

No, Britain is not all the same country. As previously stated, the island of the Britain is England, Scotland, and Wales, which are separate countries, but members of the United Kingdom, and are governed by the UK Parliament. The six Irish counties that make up Northern Ireland is still part of the UK. The rest of the Ireland, known as The Republic of Ireland, is very much not part of the UK. They did have a revolution, and won independence in 1922.