France and Britain convinced the United States to join.
A German submarine sank a ship carrying U.S. passengers.
American industrial leaders wanted war.
The United States wanted to control parts of Europe.
To work in big plantations
To fight against French colonies
To defeat Native American
To hunt for furs and do craft work
It serves as a natural border between the United States and Mexico
It combines to make the largest body of fresh water in the world
It makes it easy to transport good to the West Coast
It causes the climate around them to be warm and dry
A period of drought and soil erosion occurred.
The natural gas underground was tapped
Rivers and railroads could not transport goods.
Commercial farms took over small farms
The British had a stronger army and more money than the French.
The British were fur trappers who knew the land.
The British had better relations with Native Americans than the French.
The British convinced Spain to be their ally.
An area that the Great Lakes drain into
An area between the Rockies and the Sierra Nevada Mountains
An area in Mexico that is a desert
An area in Louisiana where the Mississippi empties.
To learn from Aztec astronomers
To explore and conquer the Americas
To introduce horses and dogs to Mexico
To make peace between the Maya and Aztecs
Covered wagon and horses
Cars and trucks
Paved roads and highways
Canals and railroads
Border with Mexico
Phoenix and Denver
Dallas and Houston
San Francisco and Los Angeles
St. Louis and Seattle
Pollution rotted the limestone rock
Seeping water formed underground caves and pools
Earthquakes caused caverns to form
Mexican engineers drilled tunnels under mountains