coming up this weekend, tonight, 9:05 p.m., a look at world war i and the environment with tim kellernmental histories of world war i. he will discuss the diverse ecological impacts world war i had across the globe and how it went beyond physical changes to european battlefields, shifts in agricultural production, and the displacement of wildlife and humans. on sunday, at 3:00 p.m. eastern, here about yale's first female students after the university opened its doors to women in 1969 for the first time in its 268 year history with and gardner perkins, author of yale needs women. then at 6:00 p.m. on american artifacts, the newly completed dwight d. eisenhower memorial located to u.s. capitol and set for dedication on september 17. at seven :00 p.m., watch the 1960 presidential debate between

9:05 p.m., a look at world war i and the environment with tim keller, coeditor of environmental histories of world war i. he will discuss the diverse ecological impacts world war i had across the globe and how it went beyond physical changes to european battlefields, shifts in agricultural production, and the displacement of wildlife and humans. on sunday, at 3:00 p.m. eastern, here about yale's first female students after the university opened its doors to women in 1969 for the first time in its 268 year history with and gardner perkins, author of yale needs women. then at 6:00 p.m. on american artifacts, the newly completed dwight d. eisenhower memorial located to u.s. capitol and set for dedication on september 17. at seven :00 p.m., watch the 1960 presidential debate between john f. kennedy and richard nixon. watch american history tv this weekend on c-span3. host: we are back and we will spend this next segment talking about right wing extremism in the united states. with us is author and university of massachusetts lowell professor arie perliger, who is the author of american zealot