I too am searching for an Anna McDonald b. June 10, 1854,in county Entruim, Ireland. Came to America in 1863. She lived about 3 mi. west of Markesan, WI and married Henry Corts on June 6, 1873 in Ripon, Wi. They farmed in Mackford until her death in 1908. Would she connect with your McDonald family in any way?