What was one major cause of world wide conflict during the first decade of the 21st century

disagreements over which groups should control territory and resources

Explanation:

I'm sorry if this is the wrong answer, I just learned this module

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.