"Project Mastodon" by Clifford D. Simak is a science fiction novel written during the mid-20th century. The story deals with themes of time travel and human ambition, exploring the consequences of seeking to establish a new nation in an ancient world populated by prehistoric creatures. It follows a group of men navigating the political landscape of their time while grappling with the environmental and social challenges of living in the Pleistocene era. The narrative centers around Wesley Adams, ex-ambassador Chuck Hudson, and Secretary of State John Cooper, who venture back in time using a time machine and establish a new nation called Mastodonia in a distant past filled with mammoths and saber-tooths. As they attempt to gain recognition for their new country, they face various obstacles, including conflicts with government officials back in their own time. The trio struggles with the logistics of survival and grapples with their hopes and dreams of returning home, ultimately inducing questions about purpose and legacy as they navigate a primitive landscape. The story highlights the themes of human ingenuity, the quest for national identity, and the complexities of coexistence in an unforgiving environment. (This is an automatically generated summary.)