Template:C21_year_in_topic
| C21 year in topic by topic: |
| News by month |
| Jan - Feb - Mar - Apr - May - Jun Jul - Aug - Sep - Oct - Nov - Dec |
| Arts |
| Architecture - Awards - Architecture - Awards - Movies - Home video - Literature (Poetry) - Music (Country, Metal, UK) - Radio - Television |
| Politics |
| Elections - Int'l leaders - Politics - State leaders - Sovereign states |
| Science and technology |
| Archaeology - Aviation - Birding/Ornithology - Meteorology - Rail transport - Science - Spaceflight |
| Sports |
| Sport - Athletics (Track and Field) - Australian Football League - Baseball - Football (soccer) - Ice Hockey - Motorsport - Tennis - National Rugby League |
| By place |
| Argentina - Australia - Canada - European Union - France - India - Iraq - Ireland - Japan - Kenya - Luxembourg - Malaysia - Mexico - New Zealand - Norway - Pakistan - Singapore - South Africa - Sri Lanka - United Kingdom - United States - Zimbabwe |
| Other topics |
| Awards - Games - Law - Religious leaders - Video gaming |
| Birth and death categories |
| Births - Deaths |
| Establishments and disestablishments categories |
| Establishments - Disestablishments |
| Works and introductions categories |
| Works - Introductions |
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