What happened during and how did each of the following impact expansion and the map of the United States?

1. Texas annexation
2. The Mexican American war
3. Mexican cession
4. The Gadsden purchase

if this is 30 points how come is this 15 it say but anyways yeah I need this one also any body got a thought of what it could be

some people are just against it im not sure but i think everyone deserves to be treated equally i think people have a problem with it because its different and not like everything else i hope this !

< < < emily> > >