What are upton and sinclair and lincoln steffens known for doing?

His novel The Jungle- Upton Sinclair

Lincoln- his article McClure's Magazine

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.