wars, too, with forests and what have you. it is a constant battle and it's forever going on. professor brady: it is, it is. i think that is an excellent point, scott. humans, for millennia, have tried to control nature. nature has a certain resilience even in the face of something like operation ranch hand, even white phosphorus in napalm and the strafing of bombs and artillery. and that is the focus of environmental history. that is the purpose of our studying it, to a that nature has an effect on our human history. ok. well, that is the end of class today. so, i will see you next week. thank you very much. if you have questions, feel free to, and talk with me. [captioning performed by national captioning institute] [captions copyright national cable satellite corp. 2015] >> you're watching american

history tv. all weekend, every weekend on c-span 3. follow us on twitter, for information on our schedule and to keep up with the latest industry news. week, and history tv's visitsan artifacts" museums and historic places. up next we visited the library of congress on capitol hill to learn about an event marking the anniversary of the civil rights act of 1964. adrienne: good morning. canon. is adrienne i am one of the curators for the library's current exhibits commemorating the voting rights act of 1964 and the civil rights act of 1964, hour-long struggle for freedom. the exhibit takes its subtitle

from the speech that president before theson read nation up on these signing of the act on july 2, 1964. this is the copy that was put into the teleprompter. fellownt johnson: my americans i'm about to sign into law the civil rights act of 1964. i want to take this occasion to talk to you about what that law means to every american. 188 years ago this week, a small band of valiant men began a long struggle for freedom. adrienne: he did six drafts of the speech and then he added "long"raneously the word

to indicate the many centuries and the slow progression toward realizing civil rights. when it was passed, it encompassed all americans. americans of all race, national origin. it is really about the ongoing struggle to achieve that more perfect union. [indistinct conversations]