The book “Rubicon of Theodore Roosevelt” is a biography of one of the most prominent politicians in the history of the United States. The famous naturalist and writer, traveler, cowboy and sheriff, the first American Nobel Prize laureate and 26th President of the United States, Theodore Roosevelt has always evoked polar assessments. He was idolized, called "King Teddy" and hated as an upstart and radical. The book tells about the political conflicts at the turn of the 19th and 20th centuries and the difficult Russian-American relations of that time. The book is intended for a wide range of readers. The publishing layout is preserved in PDF A4 format.