January 9

Martyrs' Day (Panama)
Martyrs' Day is a Panamanian holiday which commemorates the January 9, 1964 riots over sovereignty of the Panama Canal Zone. The riot started after a Panamanian flag was torn during conflict between Panamanian students and Canal Zone Police officers, over the right of the Panamanian flag to be flown alongside the U.S. flag.
http://en.wikipedia.org/wiki/Martyrs%27_Day_(Panama)

Republic Day (Republika Srpska)
On 9 January 1992, Bosnian Serb authorities declared the creation of the Serbian Republic of Bosnia and Herzegovina, now called Republika Srpska ("Serb Republic", not to be confused with the Republic of Serbia) as a state within the country of Bosnia of Herzegovina. Republika Srpska now celebrates Republic Day on the anniversary of the state's creation.
http://en.wikipedia.org/wiki/Republic_Day

1799 - Income Tax introduced in UK
1970 - Constitution of Singapore enacted
1987 - New Nicaraguan constitution takes effect

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