The Library of Congress, one of the oldest federal cultural institutions in the United States, was established on April 27, 1800. It was initially funded with a $5,000 allocation and has since grown to become the largest library in the world, holding more than 170 million items. --AI analysis

During the War of 1812, American troops captured the town of York, which is now known as Toronto, on April 27, 1813. This battle was part of a larger campaign to control the Great Lakes and the border between the United States and British North America. --AI analysis

On April 27, 1865, the Sultana, a steamboat carrying over 2,400 passengers, including many Union prisoners of war, exploded and sank in the Mississippi River. The disaster resulted in the deaths of an estimated 1,800 people, making it one of the worst maritime disasters in U.S. history. --AI analysis

On April 27, 1909, Sultan Abdul Hamid II of the Ottoman Empire was overthrown in a coup d'etat. He was succeeded by his brother, Mehmed V, marking a significant shift in the leadership of the empire during a time of political upheaval. --AI analysis

On April 27, 1941, German forces entered Athens, marking a pivotal moment in World War II. The invasion led to the eventual fall of Greece, which became an occupied territory under Axis control until its liberation in 1944. --AI analysis

On April 27, 1961, Sierra Leone officially gained independence from the United Kingdom, becoming a sovereign nation. This marked the end of British colonial rule and the beginning of a new era for the West African country. --AI analysis

On April 27, 1992, the Federal Republic of Yugoslavia was proclaimed, comprising the remaining Yugoslav republics of Serbia and Montenegro. This followed the dissolution of the Socialist Federal Republic of Yugoslavia in the early 1990s. --AI analysis

On April 27, 1993, the World Trade Center in New York City was bombed, resulting in the deaths of six people and injuries to over 1,000 others. The attack was carried out by a group of Islamic extremists and marked one of the first major terrorist attacks on U.S. soil. --AI analysis

On April 27, 2005, the Airbus A380, the world's largest commercial airliner, made its maiden test flight from Toulouse, France. The flight marked a significant milestone in aviation history and paved the way for the A380's entry into commercial service in 2007. --AI analysis