Based on reliable news sources, his biographer and his own writings, the most powerful man of his era has been referred to as an "egomaniac" and a "narcissist," possessing a "big mouth" with an "impulsive style," unable to differentiate between truth and falsehood, preferring emotion over facts, focused on national greatness and law and order, fearful of "foreignization," prone to coarseness and put-downs in speeches, and fond of "mantralike phrases" filled with "accusations, vows of revenge and promises for the future."

1. Depravity

The man described above is Adolf Hitler. All of the descriptions were attributed to the Nazi leader: some by news media in the 1930s, some by modern historian and biographer Volker Ullrich, some by Hitler himself in Mein Kampf.

Eerily familiar to the present day.

2. Racism

Donald Trump placed a painting of Andrew Jackson in the Oval Office, apparently feeling pleased that, in his own words, "a lot of people, they compare the campaign of Trump with the campaign of [Jackson]."

Andrew Jackson may have been our most racist president. To him, Native Americans were only "savages" standing in the way of progress. For 10 years Jackson arranged so-called treaties with Indians in the American southeast, setting up his own friends as land agents, traders and surveyors while encouraging white squatters to take over the land. Eventually recognizing Florida as vital to "national security," he initiated raids on Seminole villages, burning down homes and forcing out residents, in the name of the "immutable laws of self-defense." The result was the Trail of Tears, where thousands of sick and starving Cherokees were driven from their homes and forced to walk 1,000 miles in the middle of winter to unfamiliar and unproductive land far from home.

Indian removal, according to Jackson, would help the Native Americans to "cast off their savage habits and become an interesting, civilized, and Christian community." He hypocritically added, "Say to the chiefs and warriors that I am their friend…[their land] they shall possess as long as grass grows or water runs."

Jackson didn't reserve his enmity for Native Americans. He was the only president to have driven a "coffle" of chained slaves to work in faraway locations. As a reward for returning one of his runaway slaves, he promised "ten dollars extra, for every hundred lashes any person will give him."

3. Simplemindedness

Ronald Reagan said, "Government is the problem." Donald Trump said, "Good people don't go into government."

There are other similarities, many of them reported by historian William E. Leuchtenburg, author of The American President: From Teddy Roosevelt to Bill Clinton. Says Leuchtenburg, "No one had ever entered the White House so grossly ill informed." A Reagan presidential aide remarked, "He made decisions like an ancient king…passively letting his subjects serve him, selecting only those morsels of public policy that were especially tasty."

Reagan provided entertaining moments that Trump is beginning to emulate with newer technology. According to Indiana congressman Lee Hamilton, during a meeting on the MX missile, "Reagan’s only contribution throughout the entire hour and a half was to interrupt somewhere at midpoint to tell us he’d watched a movie the night before." On the day before a global summit meeting he was given a briefing book, which he never opened, and when asked about it by chief of staff James Baker, Reagan replied, "Well, Jim, The Sound of Music was on last night."

Reagan had his movies, Trump his television, which he watches for hours, apparently searching for news about himself and at times turning it into official policy. According to Fortune, "At least five times since he took office on Jan. 20, Trump has tweeted about policy ideas and thoughts that seem directly related to news that was being shown on channels such as Fox News."

Through the 1980s, Reagan's staff "protected him by severely restricting situations where he might blurt out a fantasy" while "keeping the press at shouting distance or beyond." Yet he "alarmed members of his staff by flying into a rage if the press reported that he had changed his position on an issue, even when he undoubtedly had."

4. Ecocide

Stalin destroyed not only people, but also the environment. In An Environmental History of Russia, it is stated that "During the Stalin era, state-mandated programs…ensured that economic development was the sine qua non of decision making. Those who stood in the way of the programs…were often labeled 'wreckers.' The 'wreckers' included some of the nation’s most able biologists, forestry and fisheries specialists, agronomists, and ecologists. Officials…came to consider nature itself an 'enemy of the people.'"

"We cannot expect charity from nature," said Stalin. "We must tear it from her."

Donald Trump has shown the same disdain for the earth with statements like, "The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive." His new Secretary of State Rex Tillerson is an obfuscating climate change denier whose company, Exxon, has been linked to the great majority of other climate change deniers.

5. Corruption

Historian Kevin Kruse might be providing some insight into Donald Trump's mind in his summation of Warren G. Harding, considered by many to be the worst president: "He felt woefully underqualified for the job…so he surrounded himself with old friends…who themselves were unqualified for the jobs they held and many of them corrupt."

Historian Eric Foner goes on to discuss Harding's and Coolidge's corruption in office, and their penchant for "channeling money and favors to big business." The two presidents, says Foner, "slashed income and corporate taxes and supported employers' campaigns to eliminate unions."

"Never before," said the Wall Street Journal at the time, "has a government been so completely fused with business."

Until today.