How many times have the people of the United States had to defend themselves against oppression?
3 times for sure. Revolutionary War, war of 1812, and the Civil War. Both sides thought they were defending themselves against oppression. IMO, the main problem is when people somehow come to the conclusion that civilized nations are immune to oppression, invasion, and/or tryannical governments. There have been invasions, wars, the loss and and creation of countries since countries were first organized. What makes people think that it will all stop just because of the times we live in? The Roman empire was the most civilized and powerful nation of its time, but it still fell. Now that I think of it, many Americans, especially along the southern border are being forced to defend themselves against oppression from the Mexican drug cartels...this is especially so considering our government is not doing its job in protecting our borders.
The Revolutionary War was pre-United States, 1812 was a war declared by the USA on Britain followed by an invasion of Canadian territory and the Civil War...well, that is an interpretation I suppose...
The 1812 war is an interesting read actually, I had heard of it but never knew anything about it...in fact I assumed it was to do with Mexico...that was clearly a different one.
I would humbly submit that the fall of the Roman Empire is a bit more complicated than outside oppressive forces.
Remember it was an empire, consisting of an amalgam of territories acquired largely by force - it could be argued that they, in fact, were the oppressors.
I'm not comparing the Roman empire specifically to the U.S., but simply saying that large nations have fallen in history and will continue to fall. Hell, the U.S.S.R fell less than around twenty years ago. My point in all this is that many people assume that because of "the time" there's no need to defend yourself from anything. Supposedly our laws protects us and our governments are "just." We know all this to be a ferry tale.
As far as Mexico is concerned...
1. Right now the Mexican citizens are being supressed by drug cartels. Citizens are no allowed to own firearms and to have one is a sizeable punishment. Google the number of Mexican citizens killed in the last few years on the U.S. southern border...IT WOULD SHOCK YOU.
2. The American-Mexican war was fought when Texas was annexed to the U.S. The Mexican army had already been defeated when Texas fought for it's own independence. Texas was actually it's own country for a while...when they were annexed, it pissed Mexico off and they deemed to fight for territory they believed was theirs. It was hardly an oppression of the citizen population.