What started the mexican american war?

What did the treaty of Guadalupe Hidalgo do?

in 476 c.e. romulus, the last of the roman emperors in the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the roman empire had brought to western europe for 1000 years was no more.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

d. dr. francis collins