For centuries, the adjective "black" has been applied to days upon which calamities occurred. Many events have been described as "Black Friday", although the most significant such event in American History was the Panic of 1869, which occurred when financiers Jay Gould and James Fisk took advantage of their connections with the Grant Administration in an attempt to corner the gold market. When President Grant learned of this manipulation, he ordered the Treasury to release a large supply of gold, which halted the run and caused prices to drop by eighteen percent. Fortunes were made and lost in a single day, and the president's own brother-in-law, Abel Corbin, was ruined.
On September 24, 1955, President Eisenhower suffered a heart attack; his condition was initially believed to be life-threatening. Eisenhower was unable to perform his duties for six weeks. The 25th Amendment to the United States Constitution had not yet been proposed, and the Vice President had no formal power to act. Nonetheless, Nixon acted in Eisenhower's stead during this period, presiding over Cabinet meetings and ensuring that aides and Cabinet officers did not seek power.
On September 24, 2012, Google launched Google for Entrepreneurs, a largely not-for-profit business incubator providing startups with co-working spaces known as Campuses, with assistance to startup founders that may include workshops, conferences, and mentorships.
The temporary order was replaced by Presidential Proclamation 9645 on September 24, 2017, which permanently restricts travel from the originally targeted countries except Iraq and Sudan, and further bans travelers from North Korea and Chad, along with certain Venezuelan officials. After lower courts partially blocked the new restrictions, the Supreme Court allowed the September version to go into full effect on December 4, and ultimately upheld the travel ban in a June 2019 ruling.
On 24 September, Ardern became the first female head of government to attend the United Nations General Assembly meeting with her infant present. Her address to the General Assembly on 27 September praised the United Nations for its multilateralism, expressed support for the world's youth, and called for immediate attention to the effects and causes of climate change, for the equality of women, and for kindness as the basis for action.
After the whistleblower complaint became known in September 2019, House speaker Nancy Pelosi initiated a formal impeachment inquiry on September 24. The Trump administration subsequently released a memorandum of the July 25 phone call, confirming that after Zelensky mentioned purchasing American anti-tank missiles, Trump asked Zelensky to investigate and to discuss these matters with Trump's personal attorney Rudy Giuliani and Attorney General William Barr. According to the testimony of multiple administration officials and former officials, the events were part of a broader effort to further Trump's personal interests by giving him an advantage in the upcoming presidential election.