Chapter 21 1/2Online version World History by Wylie York 1 Group 1 2 Group 2 3 Group 3 4 Group 4 5 Group 5 6 Group 6 The Monroe Doctrine A policy meant to limit European colonies in the Americas This country sold the Louisiana Territory to the US France This country sold Alaska to the US Russia This caused war between the US and Mexico Texas becomes a US state Many Americans thought that this was a bad idea US purchase of Alaska They had the most factories during the Civil War The North