Final answer:
Westward Expansion had unintended consequences on Native Americans, Hispanics, and the issue of slavery, which still impact the United States today.
Step-by-step explanation:
Westward Expansion in the 19th century had several unintended consequences that still impact the United States today. One major consequence was the displacement and mistreatment of Native American tribes as settlers encroached on their land. This led to conflicts and wars between the United States and Native Americans. Another consequence was the exploitation of Mexican territories, which contributed to tensions between the United States and Mexico and had lasting effects on the Hispanic populations of Texas and California.
Additionally, westward expansion heightened the debate over slavery, as new territories were divided between free states and slave states. This eventually led to the American Civil War. The legacy of westward expansion and its consequences can still be seen in the ongoing struggles for Native American rights, the demographics of the Southwest, and the racial tensions that persist in the United States today.