Asian immigrants were often paid less than white workers and suffered from discrimination at the work sites because of their unique culture.

Mexicans who were living in land surrendered by treaty to the United States faced discrimination after the Mexican-American War.

Ranchers and cowboys competed with rustlers and often came in conflict with the townspeople they met during cattle drives.

What conclusion can be drawn from these statements about America's westward expansion?

A) America's westward expansion was a peaceful and smooth process.
B) As the American nation expanded westward, many groups faced challenges and had to deal with conflict.
C) America's westward expansion would not have been possible without the supervision of the federal government.
D) As the American nation expanded westward, many groups worked together and cooperated in order to achieve common goals.