Many mexicans who lived on land that was part of the mexican cession
a. had to give up their land and relocate to mexico.
b. became us citizens and added to the area’s population.
c. were not allowed to own property in the united states.
d. fought the americans even though the war was over.

I believe the answer is: B. became US citizens and added to the area’s population.

the mexican cession refers to the region of united states that taken from Mexico after united states won the mexican-american war. After winning the war, the previously united states citizens were forced to became US citizens, added to area's population, and had to pay their taxes to the american government.

war never

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.