Located at the Rocky Mountains. this is an imaginary line which splits the United States' river systems.

This civilization was the first to settle what is current day western United States

This is a major city located on the coast of California

This area is home to lots of wooding and forests.

This is a home built by native Americans in the southwestern USA

Caused by removal of roots in the great plains, this disaster was detrimental to the areas inhabitants

This is the area where the elevation becomes to high for trees to grow.

This state was bought by the United States in the late 50's $7,000,000.

Due to low rainfall this is a huge issue for the United States west of the Mississippi River.

This place is where cold air from the Rocky Mountains meets warm air from the Gulf of Mexico causing many tornadoes.

This independent country was annexed by the USA in 1845.

This industry is responsible for making vehicles used in outer space.

Widely used in the western United States this is the process of bringing in water to dry land.

This is the idea that the USA had the right to expand all the way to the Pacific Ocean.

Spanning from Canada to Mexico, the worlds largest Free-Trade zone was established by this agreement