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.
Be aware: Your state tax liability may be affected by changes on your federal return. For information on how to correct your state return, contact your state tax agency. The normal processing time for an IRS Form 1040X, Amended U.S. Individual Income Tax Return is between 8 and 12 weeks from the IRS receipt date.