Imperialism By jayrobertson Aug 28, 1867 United States annexed Midway Island Oct 18, 1867 US purchases AK 1890 U.S. Census Bureau announces the closing of the American frontier Period: 1890 to 1914 U.S. Imperialism Jan 17, 1893 Overthrow of Queen Liliuokalani of Hawaii Feb 15, 1898 U.S.S. Maine explodes = Start of the War w/ Spain Jul 7, 1898 U.S. annexes Hawaii Dec 10, 1898 3rd Treaty of Paris signed =Spanish-American War ends Dec 10, 1898 U.S. gains control of Puerto Rico, Guam, and the Philippines. 1899 Boxer Rebellion in China Feb 4, 1899 Philippine-American War starts Jun 6, 1899 Hay releases Open Door Notes Jun 6, 1899 Hay releases Open Door Notes 1900 U.S. obtains Samoa May 3, 1903 Platt Amendment is passed 1904 Roosevelt Corollary announced Jun 28, 1914 Archduke Franz Ferdinand is assassinated; starting WWI Aug 15, 1914 Panama Canal opens