1910-1920 1911 First transcontinental flight takes 82 hours; nearly 2 months. 1912 Girl Guides (Girl Scouts) founded March 12. 1912 New Mexico admitted as 47th state on Jan 6. 1912 Arizona admitted as 48th state on Feb 14. 1912 Titanic hits iceberg, April 15. 1503 lives lost. 1913 Woodrow Wilson takes oath on March 4; becomes 28th President. 1913 Harriet Tubman, heroine of underground railroad, dies; buried in Ohio. 1913 16th Amendment legalizes income tax which was enacted illegally in 1861. 1913 17th Amendment changed election of Senators to direct election instead of appointment by state legislatures. 1914 Panama Canal completed. 1914 World War I begins in Europe; President Wilson declares neutrality. 1915 SS Lusitania sunk May 7; 1198 lives lost. 1916 General John "Blackjack" Pershing chases Pancho Villa deep into Mexico. 1917 Woodrow Wilson takes oath on March 4; begins 2nd term. 1917 United States enters WW I -- April 6. 1917 Russian Revolution. The Bolsheviks are led by V. I. Lenin 1917 Father Edward Flanagan founds Boy's Town, December 1. 1918 Armistice ends WW I on 11th hour of 11th day of 11th month. 1918 The Pandemic of '18 -- world wide flu outbreak kills 25 million. 1919 18th Amendment introduces prohibition of intoxicating liquors. 1920 19th Amendment finally brings women the vote, Aug 26.