3rd January » Joseph Jenkins Roberts is sworn in as the first President of Liberia e.g president of the independent African Liberia.
12th January » The Sicilian revolution of independence of 1848 or Palermo rising takes place in Sicily against the House of Bourbon known as Bourbon Kingdom of the Two Sicilies.
31st January » John C. Frémont is Court-martialed for mutiny and disobeying orders.
2nd February » Mexican–American War: The Treaty of Guadalupe Hidalgo is signed.
2nd February » California Gold Rush: The first ship with Han Chinese called Chinese immigrants arrives in San Francisco.
21st February » Karl Marx and Friedrich Engels publish 'The Communist Manifesto'.
22nd February » The French Revolution of 1848, which would lead to the establishment of the French Second Republic, begins.
24th February » List of French monarchs or King Louis-Philippe of France abdicates the throne.
10th March » The Treaty of Guadalupe Hidalgo is ratified by the United States Senate, ending the Mexican–American War.
11th March » Louis-Hippolyte Lafontaine and Robert Baldwin become the first Prime Ministers of the Province of Canada to be democratically elected under a system of responsible government.
15th March » A Hungarian Revolution of 1848 e.g revolution breaks out in Hungary. The Habsburg rulers are compelled to meet the demands of the Reform party.
18th March » Revolutions of 1848 in the German states e.g March Revolution: in Berlin there is a struggle between citizens and military, costing about 300 lives.
20th March » Revolutions of 1848 in the German states: Monarch called King Ludwig I of Bavaria abdicates.
23rd March » The ship 'John Wickliffe (ship) John Wickliffe' arrives at Port Chalmers carrying the first Scotland Scottish settlers for Dunedin, New Zealand Dunedin, New Zealand. Otago province is founded.
18th April » American victory at the battle of Cerro Gordo opens the way for invasion of Mexico.
18th May » Opening of the first German National Assembly (Frankfurt Parliament named Nationalversammlung) in Frankfurt, Germany.
19th May » Mexican–American War: Mexico ratifies the Treaty of Guadalupe Hidalgo thus ending the war and ceding California, Nevada, Utah and parts of four other modern-day U.S. states to the United States for US$15 million.
22nd May » History of Martinique 1815-1899 or Slavery is abolished in Martinique.
29th May » Wisconsin is admitted as the 30th U.S. state.
2nd June » The Prague Slavic Congress, 1848 e.g Slavic congress in Prague begins.
21st June » In the Wallachian Revolution of 1848 called Wallachian Revolution, Ion Heliade Rădulescu and Christian Tell issue the Proclamation of Islaz and create a new republican government.
23rd June » Beginning of the June Days Uprising in Paris, France.
26th June » End of the June Days Uprising in Paris.
3rd July » Slaves are freed in the Danish West Indies (now U.S. Virgin Islands) by Peter von Scholten in the culmination of a year-long plot by enslaved Africans.
11th July » London Waterloo station named Waterloo railway station in London opens.
29th July » Great Famine (Ireland) Irish Potato Famine: Young Irelander Rebellion of 1848 Tipperary Revolt In Tipperary, Ireland, then in the United Kingdom, an unsuccessful Irish nationalism nationalist revolt against British rule is put down by police.
14th August » Oregon Territory is organized by act of Congress.
19th August » California Gold Rush: The 'New York Herald' breaks the news to the East Coast of the United States of the gold rush in California (although the rush started in January).
22nd August » The United States annexes New Mexico.
13th September » Vermont railroad worker Phineas Gage survives a convert 3 ft m adj=on-plus iron rod being driven through his head; the reported effects on his behavior and personality stimulate thinking about the nature of the brain and its functions.
20th September » The American Association for the Advancement of Science is created.
29th September » Battle of Pákozd: Stalemate between Hungarian and Croatian forces at Pákozd; the first battle of the Hungarian Revolution of 1848.
28th October » The first railroad in Spain between Barcelona and Mataró is opened.
1st November » In Boston, Massachusetts, the first medical school for women, The Boston Female Medical School (which later merged with the Boston University School of Medicine), opens.
3rd November » A greatly revised Dutch constitution, drafted by Johan Rudolf Thorbecke, severely limiting the powers of the Netherlands known as Dutch Dutch monarchy called monarchy, and strengthening the powers of parliament and ministers, is proclaimed.
9th November » Robert Blum, a Germany known as German revolutionary, is executed in Vienna.
2nd December » Franz Josef I of Austria called Franz Josef I becomes Emperor of Austria.
5th December » California Gold Rush: In a message to the Congress of the United States called U.S. Congress, U.S. President James K. Polk confirms that large amounts of gold had been discovered in California.