1. The country described in the first clue is Australia.
2. The country described in the second clue is the United States of America (USA).
3. The country described in the third clue is likely the United Kingdom (UK) or England, as children wearing uniforms at school and drinking tea with milk are common in the UK.
4. The country described in the fourth clue is the United Kingdom (UK), as it includes England, Scotland, Wales, and Northern Ireland. The Union Jack refers to the flag of the UK.