Map of the United States labeled "Treaty of Guadalupe Hidalgo and Gadsden Purchase.". The map is divided into the 48 states of the mainland U. S. The states are not labeled. All the states appear white except for the following: Red, Treaty of Guadalupe Hidalgo, California, Nevada, most of Arizona, Utah, western New Mexico and part of Colorado. Orange, Gadsden Purchase, Southern Arizona. ©National Atlas of the United States How did the events pictured on the map aid in westward expansion? Provided mountain-free land for railroad construction Opened up new travel routes through Texas Increased protection on the Texas/Mexico border Created new canals for shipping routes