Mar 1854–Aug 1855Ayutla Revolutionoverthrows Santa Anna
Mar 1854Cmdr. Perryopens Japan
30 May 1854Kansas-Nebraska Actcreates new territories& repeals 1820Missouri Compromise
Jul 1854US bombardsMosquito Coast
Oct 1854US demandscession of Cuba
May–Oct 1855William Walkerconquers Nicaragua
Sep 1855–Sep 1858Yakima War
21 Nov 1855–29 Jul 1859Bleeding Kansas