The Best American President Every american president has left behind some kind of legacy, but whos was the best? Theodore Roosivelt was the best american president, because in his time as president he acomplish many Demestic accomplishments and Foregin policy accomplisments. Theodore Roosivelt is widely regarded as the first morden president, the stature and influence that the office has today began to develped when president roosivelt was in office. "His presidency endowed the progressive movement with credibility, lending the prestige of the White House to welfare legislation, government regulation, and the conservation movement."(Miller Center). A couple demestic accomplishments made by Theodore Roosivelt are, Promoted the conservation