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Leaders Since 1900

Who led each country, for which party, from month/year to month/year — newest first.

Country A Country B

Notes

Shows the head of government: the U.S. President; the Prime Minister in India, Canada and Australia. India before independence (Aug 1947) shows the British Viceroy.
Australia's list starts at Federation in January 1901; before that it was six separate colonies.
Leaders already in office in 1900 are included from their start date. Acting and caretaker terms are listed and labelled.
Current office-holders checked October 2026.