Do we want to spend our hard earned money on them?!? No we don't we don't want to pay off their debt!!!
Do we want to make Mexico mad?!?!NO!!!!!
We don't want to make our good trading system with Mexico to stop we are getting good stuff from the Mexico!!
Do we want another SLAVE STATE?!? NO!!!
We don't want to deal with another SLAVE STATES problems. We want to keep the number of Slave States and Non-Slave States balanced. So that way one part of the country have more power. We want it balanced.