Answer:
On a positive side, the US gained:
- gold,
- coal,
- oil,
- innovative ideas from the Mexicans,
- new products,
- new crops.
- US citizens became wealthy in Mexico's lost territory.
On the negative side, they gained:
- a large bill from Mexico demanding they pay for their losses from the Native American raids.
- violent arguments whether to allow slavery in new territories
- US could not build railroads because the land was not mountain free.
Step-by-step explanation:
hope this helps!