Mexican and american troops clash somewhere north of the rio grande in spring of 1846 both generals claim they had been on their own soil
President Polk declared "American blood has been shed on American soil" and on May 13, 1846, the United States declared war on Mexico.
More than 5000 texans will immediately answer the call to serve their country edward burleson albert sidney johnston and mirabeau lamar served as officers as well as a number of texas rangers who serve as scouts for the army
U.S. general zachary taylor will immediately march his troops over land into mexico and capture monterrey and later defeated santa anna and his army at buena vista in the fall of 1847 general winfield scott will land his troops at vera cruz and capture the mexican capitol of mexico
On February 2 1848 , the war ends with the signing of the Treaty of Guadalupe-Hidalgo
In the end, even though the U.S was victorious in their pursuit of manifest destiny, it began a political debate about the issue of slavery that would end in a civil war.It forced Americans to come to terms with the of slavery and the U.S Constitution.