On February 12, 1914, the same day as Lincoln’s birthday in Hardin County, Kentucky in 1809, construction of the Lincoln Memorial was began after the groundbreaking was held. A year later, on the same day, the cornerstone of the memorial was placed. By May 1915, the sub-foundation and the foundation of the memorial, which lay on drained and filled land, was completed.
1914 – The Groundbreaking Of The Lincoln Memorial
Hamilton Historical Records 