The chain email said that over 200 years ago, the United States had declared war on Islam, and Thomas Jefferson led the charge! The Barbary powers were Muslim, and religion sometimes crops up in the historical record.
You need to use Form 1040X, along with a new Form 1040, plus any other necessary schedules and forms. Amended tax returns have to be mailed to the IRS on paper for manual processing. The IRS typically processes an amended return about 8 to 12 weeks, but this process can take longer during the IRS's busiest times.
How long will it take the IRS to process my return? Generally, once your return is e-filed you will receive an acknowledgement email within 48 hours. This email will let you know if your return was accepted or rejected. If your return is rejected, you can simply log in to your account, make the corrections, and resubmit your return at no additional charge.