Vodka Absolu Ad, an outrage in the U.S!!

I found out about the Mexican ad for the Vodka Absolut picture today from my history teacher. I was told that some American's (not me) mostly the White Conservatives were outraged that the ad showed the US cut in half, while the South-Western part of the US belonged to Mexico. This was the scenario before the Mexican-American War. The Mexican-American War, woah!! Now if there was ever an unjustified war it was that one!! The US acted just like Nazi Germany did when they invaded Poland and its neighbors. Under the so called belief of "Manifest Destiny" The US waged an Aggressive war against Mexico. Finally beating them, and forcing them to hand over all that chunk of land. But people say "no we paid them, we paid them!!" yeah you paid 65 million dollars for a half of the US!!! All I'm trying to say is that Mexico was invaded unfairly, remember the alamo?? Well thats one of the places that took part in the war, I'm sure everyone heard of the heroic of the Alamo by the American's, but they invaded Texas, because it was part of Mexico, they were squatters! They came from the East to settle in Texas (illegally). And then they wanted to annex Texas into the US, just cause they liked it there. I just don't understand what people are complaining at, everyone knows the US stole that land from Mexico, even Abraham Lincoln knew!!