What conflicts did American settlers and Mexico have?

From 1846 to 1848, U.S. and Mexican troops fought against one another in the Mexican-American War. Ultimately, it was a battle for land where Mexico was fighting to keep what they thought was their property and the U.S. desired to retain the disputed land of Texas and obtain more of Mexico's northern lands.

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

i think it was   tsar alexander ii