[dragonwriter]

> Though the first income taxes came along to pay for war - I guess all the United States needs to do is stop being in the business of war and the income tax could go away.

The first income tax came to pay for the Civil War; I don't think the US is going to give up on maintaining it's territorial integrity, even if it gave up on foreign wars.

[SketchySeaBeast]

Absolutely true. Though I'd argue at this point that the only way the United States would face a war that could be fought conventionally internally, it would be by a foe that's using the resource of the United States Army, as I don't believe there'd be another other viable option. We're a little far away from when every man had equivalent firepower to a member of the United States forces in their closet.

It would also seem to be a very hard line to draw in regards to "preventing external threats". An argument could be made that that's exact what's happening right now, and that it's aggressive posture and presence around the world is solely in self defense, so really, the industry of war probably can't ever stop, and neither can the income tax.

[dragonwriter]

> Though I'd argue at this point that the only way the United States would face a war that could be fought conventionally internally, it would be by a foe that's using the resource of the United States Army, as I don't believe there'd be another other viable option

That's true because of the income tax derived funds lavished on the US Army (and other branches.)

Were that to stop—which abandoning the income tax without a similar scale replacement would likely require—other options would rapidly open up.