What steps did the US gov't take to stop the mexicans invading Texas 200 years ago? please share with us your deep knowledge of the subject.
Since you are a completely uneducated idiot, here is a link so you can learn something about the subject you are resting your argument on. Texas was not part of the USA at the time of the Alamo, it was an independent country. The USA had little to nothing to do with the battle of the Alamo.
https://en.wikipedia.org/wiki/Timeline_of_the_Republic_of_TexasSo to recap - "200 years ago we learned Mexicans will invade our country and kill our citizens." - False on multiple fronts. Mexican's never invaded USA. Texas declared independence from Mexico, so really all participants were either Mexican or 'brand new day 1' Texans.
"so we took steps to stop them" - The US gov't and it's citizens did nothing.
"invading Texas & claiming they had a right to do so.. killing numerous American Citizens" - Virtually no American citizens were at the Alamo during the battle