What was one major cause of worldwide conflict during the first decade of the 21st century?

Competition between different groups for political power in a country

Explanation:

they lost control of territory in the middle east, but preserved turkey's political independence.

roosevelt, a progressive reformer, earned a reputation as a "trust buster" through his regulatory reforms and anti-trust prosecutions. his "square deal" included regulation of railroad rates and pure foods and drugs; he saw it as a fair deal for both the average citizen and the businessmen.