I'd point back to at least 2000 and the Supreme Court stopping the count in Florida, but maybe back to when we sabotaged the Iran hostage deal so Carter couldn't have a win

Sure, both are good examples of democracy being attacked. More broadly, I'd point to all the lies the public is fed to "nudge" us in whatever direction the political parties and lobbyists want. Its not much of a democracy if voters are asked to vote based on massive piles of bad information.

The second you have a president willing to mobilize the most advanced military in the history of the world against its own populace there's no chance of realistically resisting.

I have absolutely no expectation that Trump will actually order the military on the US populace, but even if he tried it matters whether the military would follow such an order. It could always happen, that's part of the reason I wish our federal government was drastically reduced and our standing military disbanded, but I simply can't think so little of our troops that they would actually do it.

That said, if somehow that did happen one day I fully expect to die by their gun. At that point that army becomes an invading force and I'd feel like I have no choice but to fight.

I really hope you are right about that. I worry because I listened to what he said...and he said he wants to use the military against the "enemy from within, and named specific political opponents and mentioned media figures.

I tend to believe him when he says that's what he wants to do. But you are right, one would hope the military would refuse such an unconstitutional order.

When Martin L. King was murdered there were thousands of soldiers sent to the DC. I would say that movement was rather succesfull anyways.

You mean like Abe Lincoln?