In which year did Congress first authorize the wear of the Medal of Honor?

The Medal of Honor was first authorized by Congress during the American Civil War in 1861. This prestigious award was created to recognize acts of valor by Union soldiers, and its institution marked a significant moment in U.S. military history as it sought to honor the bravery of individuals who performed extraordinary deeds in service to their country. Over time, the Medal of Honor has evolved, but its origins are deeply rooted in the events and challenges of the Civil War. The other years listed—1870, 1900, and 1945—are significant in their own contexts for military history or the evolution of military awards, but they do not align with the initial authorization of the Medal of Honor, which is specifically tied to the year 1861.