U.S Foreign policy Throughout History By ocean_uh Jul 4, 1776 Declaration of Independence Period: Jul 4, 1776 to Mar 4, 1789 Establishment Jan 10, 1781 Department of Foreign Affairs Created Sep 3, 1783 Treaty of Paris Jul 15, 1786 Moroccan-American Treaty of Friendship Period: Jul 27, 1789 to Sep 30, 1800 Early National Era Aug 18, 1795 Jay Treaty Aug 18, 1796 George Washington Against Foreign Entanglements Jun 18, 1798 Alien and Sedition Acts Jul 7, 1798 Quasi-War Period: Mar 5, 1801 to Feb 2, 1848 Jeffersonian Era Dec 22, 1807 Embargo Act Jun 18, 1812 War of 1812 Dec 24, 1814 Treaty of Ghent Dec 2, 1823 Monroe Doctrine Dec 2, 1823 Monroe Doctrine Apr 25, 1846 Mexican-American War Feb 2, 1848 Treaty of Guadalupe Hidalgo Period: Nov 7, 1849 to Sep 14, 1872 Civil War Era Apr 19, 1850 Clayton-Bulwer Treaty Apr 12, 1861 American Civil War Sep 22, 1862 Emancipation Proclamation Mar 30, 1867 Alaska Purchase May 8, 1871 Treaty of Washington Period: Sep 20, 1873 to Jan 1, 1892 James G. Blaine and Other Immigration Period: Jan 17, 1893 to Jun 28, 1914 Hawaii overthrows and then World War I Jul 4, 1894 Republic of Hawaii Apr 11, 1898 Spanish-American War Feb 4, 1899 Philippine-American War Nov 20, 1910 Mexican Revolution Period: Jul 28, 1914 to Jun 28, 1919 World War I May 7, 1915 RMS Lusitania Jan 8, 1918 Wilson's Fourteen Points Jan 10, 1920 League of Nations Mar 4, 1933 Good Neighbor Policy Period: Nov 7, 1941 to Oct 24, 1945 World War II Dec 7, 1941 Attack on Pearl Harbor Jan 1, 1942 Creation of United Nations Aug 7, 1942 War of the Pacific Mar 12, 1947 Cold War Period: Mar 12, 1947 to Dec 25, 1991 Cold War Apr 3, 1948 Marshall Plan Apr 30, 1948 Pan-American Union Apr 4, 1949 Creation of the North Atlantic Treaty Organization Jun 25, 1950 Korean War Aug 19, 1953 Overthrow of the Iranian Government Jun 5, 1967 Six Day War Aug 15, 1973 Vietnam War Oct 6, 1973 Yom Kippur War Period: Apr 1, 1992 to Nov 6, 2015 Post-Cold War Sep 11, 2001 Attack on the World Trade Center