1842. Garrison calls on free States to secede, May; death of Channing, October 2d; Brook Farm started, as are many communties about this time; Spencer's theory of the limits of government published, 1844. Morse proves value of telegraph by announcing nomination of Frelinghuysen for Vice-President by Whigs, May 1st; disunion banner publicly accepted by Garrison, June 1st; annexation of Texas and reduction of tariff decided by election on November 5th; rule against discussing slavery repealed by House of Representatives; Lowell's Poems published.
1845. Parker begins to preach regularly in Boston, February 16th; potato rot in Ireland, August; Vestiges of Creation published.
1846. Mexico invaded by U. S. troops, March; free trade established in England, June 25th, and bill to reduce American tariff signed, June 26th; first volume of Grote's Greece and first number of Lowell's Biglow Papers published.
1847. Mexicans defeated at Buena Vista by General Taylor, February 22d and 23d; death of O'Connell, May 15th.
1848. Revolution in Paris, February 22d; King abdicates, February 24th; insurrections in Munich, Vienna, Berlin, Venice, and Milan in March, afterwards in other cities; "spirit rappings" at Rochester, N.Y., begin March 31st; Chartist demonstration at London, April 10th; Emancipation decreed by French Republic, April 27th; socialist insurrection at Paris, June 23d, 24th, 25th, and 26th; "Woman's Rights" Convention at Seneca Falls, N. Y., July 19th; revolt in Ireland, July 29th; Buffalo Convention of Free Soilers, August 9th; Kossuth dictator of Hungary, September 25th; State constitution and town ordinances made in October by citizens of California without Federal sanction; pro-slavery defeat at election of Taylor, November 7th; flight of Pope from Rome, November 24th; Louis Napoleon president of France, December 10th; Lowell's Vision of Sir Launfal, Fable for Critics, and Biglow Papers published, 1849. Defeat of King of Sardinia by Austrians at Novara, March 23d, prevents liberation of Italy; Rome captured by French, July 3d; Hungarian army surrendered to Russians by Gorgei, August 13th; Venice taken by Austrians, August 28th; Emancipation Convention in Kentucky.
1850. Death of Wordsworth, April 24th, and of President Taylor, July 9th; Fugitive Slave Bill signed, September 18th; first national "Woman's Rights" Convention at Worcester, Mass., October 23d and 24th; Bradlaugh's first lecture; Hawthorne's Scarlet Letter, Spencer's Social Statics, and Tennyson's In Memoriam published.
1851. London Great Exhibition opens May ist; a fugitive slave rescued at Boston, Sunday, February 16th, another at Syracuse, N. Y., October ist; usurpation of Louis Napoleon, December 2d, 1851.
1852. Uncle Tom's Cabin published, March 20th; death of Frances Wright, and accession of Napoleon III., December 2d; Herbert Spencer announces the principle of Differentiation.
1854. Repeal of Missouri Compromise proposed by Douglas, January 23d; return of Burns, a fugitive slave, from Boston, June 2d; U. S. Constitution publicly burned by Garrison, July 4th; Kansas election carried by border ruffians, November 29th; Thoreau's Walden published.
1855. Spencer's Pyschology and Walt Whitman's Leaves of Grass published, 1856. Sumner assaulted, May 22d..