To trade sometimes people have to go very far distances and cross many different climate zones
For example in the desert climate zone, temperatures in the day can get very hot. At night the temperatures can drop below zero.
The harsh climate can affect how fast it will take for traders to get from one place to another. The climate can also affect the amount of goods or kinds of goods the traders can bring or purchase.
The United States was willing to pay more per mile for the Gadsden Purchase than for the Mexican Cession because the Gadsden Purchase gave money to the United States to build a railroad.
