2. 1898

3. 18th Amendment passed by the Senate in 1917. Ratified in 1919. Went into effect in 1920 (though some states had already enacted Prohibition in their state prior to the ratification)

4. 1905

5. It’s hard to give an exact year here. Between 1850 and 1900 coal consumption rose thirtyfold. By 1910, coal was supplying 3/4 of the nation’s energy.

6. 1901

7. 1901

8. 1865

9. Again, this is hard to list an exact year. Over a period of years, there were important steps toward a vaccine. In 1909, there was a major development. In 1916, another important discovery was made. But an effective vaccine was not created until 1930.

10. 1909

11. 1906

12. 1896

13. 1917

Hope that helps. Sorry I couldn’t give you an exact year on a few. The one about the typhus vaccine was especially difficult (go to Wikipedia and do a search for “typhus”; when you get to the stuff about the vaccine, you’ll see what I mean)