Well, even if Texas and Mexico are one war, that's still a foreign entanglement pre-1917.
As for US-Mexico,
http://en.wikipedia.org/wiki/Tampico_Affair
http://en.wikipedia.org/wiki/Ypiranga_incident
http://en.wikipedia.org/wiki/United_States_occupation_of_Veracruz
All of these predate the Pancho Villa expedition. And yes, the occupation of Veracruz was American aggression.
As for Oregon; diplomatic crises are still foreign entanglements, and a more-isolated US might not dispute the territory with Britain.
It would be more accurate to say that America limited its foreign entanglements until the end of the 19th Century. Considering that we should probably compare it to European powers, the shoe still fits. We may have been fairly involved in our near abroad, but most every European nation did more.
Your White House looked better after all the burning was hidden by whitewash, a bit like America's performance in the war!
Whoever stereotyped Canadians as consistently polite clearly never discussed 1812 with them. That date's basically a trigger to try and out-smug both Americans and Britons in a single breath.