The U.S. has a really conflicted history with the income tax. For most of American history, there was no income tax at all. At one point it was ruled unconstitutional.
Today, income tax is the federal government's main source of revenue. That raises a question: How did something that was once so strange to us become so central?
The answer includes a few wars, a Supreme Court justice on his deathbed, and Donald Duck.
For More: Read our post, "From Abe Lincoln To Donald Duck: History Of The Income Tax"