Settlers had to leave their homes and travel over mountains on foot with covered wagons.
They also faced the threat of Native Americans attacking them on their way.
Answer:
An effect of the Gadsden Purchase was that the United States gained land from Mexico to build a planned rail. The United States finally reached an agreement to pay Mexico $10 million for a portion of land.
Explanation:
The United States entered the war because of the Germans' decision to resume the policy of unrestricted submarine warfare, and the so-called "Zimmerman telegram," intercepted by the British, in which Germany floated the idea of an alliance with Mexico.