What factors led to conflict between the united states and britain in north america?

Ummm both of the groups wanted the same land so Metacom led a battle against English settlers to force them out of England?

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.