Lincoln’s navigation of the secession crisis and ensuing Civil War can legitimately be described as unprepared at best, and at moments susceptible to severe strategic missteps.
An exhaustive survey of the Presidents of the United States and everything they did wrong while in office.
In foreign affairs, the Arthur administration was as devoid of accomplishment as almost any in American history.
Everything Wrong with the (Lyndon Baines) Johnson Administration

Johnson’s actions in Southeast Asia are undoubtedly the most notorious aspect of his presidency, both in popular memory and mainstream histories.
Monroe was not a deep thinker, as were Jefferson and Madison, nor was he the charismatic leader that Washington was.
Grover Cleveland was undoubtedly the most classical liberal President the United States has ever had, but even he still committed many blunders.
Everything Wrong with the George H.W. Bush Administration

Hailed at his passing as “the most successful one-term president in the nation’s history,” George H.W. Bush has a far better claim to being the most destructive.
Everything Wrong with the Van Buren Administration

Although Van Buren himself was an effective politician, his years as president prompted scholars to rank Van Buren’s presidency as average, grouped among some of the least-effective and forgettable presidents in U.S. history
Clinton was an internationalist and believed in an activist American presence abroad, but he was unable to create a comprehensive doctrine to guide the United States into the 21st century.
For Filmore, slavery was a moral wrong, and imposing on states’ rights was a legal wrong, but for U.S. history, the chimera of legislation that became the Compromise of 1850 was a catastrophic mistake.
President Buchanan amassed the largest fiscal imbalance of a pre-Civil War administration not engaging in a foreign war and that fact only scrathes the surface of his shortcomings.