Well assuming you mean America, and not considering Civil War, I would say the draft of the Constitution Thomas Jefferson want to make slavery illegal, but he needed the southern states approval.
O The history of all hitherto existing society is the history of class struggles.
1)Palo Alto, May 8th 1846
2)Resaca de la Palmera, May 9th 1846
3)Montery, September 21 1846
4)Buena Vista, Febuary 22-23 1847
Yes, especially the mississippi river. Steamboats were used to go up and down the river