Answer: some achievements are creation of mathematics and sewage systems,
Explanation: They are things we use today for example sewage systems are now modernized into more advanced systems.
Yes, victory by the Union was inevitable regardless of how well the Confederacy fought or the intervention of any external potential allies.
Why? The North had a demographic advantage over the South - There were more people living the North than the South.
(Hope this helps!!)
TRUE it was signed over to the U.S. in the treaty of Guadalupe Hidalgo in exchange for 15 million after the war.