Like almost every president who preceded him, Lincoln's actions at the time were somewhat controversial. Some of his most controversial decisions might actually be considered now to be abuses of the Presidential power.
When you find that you need to amend a tax return, you need to make sure the statute of limitations on filing one hasn't run out. The statute of limitations, or time allowed for the action, on getting a refund from an amended tax return is three years.
The above list only includes dates for e-filing an original tax return. Amended tax returns are processed manually, and often take 8-12 weeks to process. If you do not receive an amended tax return refund within 8 weeks after you file it, then you should contact the IRS to check on the status. How to Check the Status of Your Tax Return