What political system did european countries set up that caused conflicts in the middle east?

Mandates.

Explanation:

The European governments imposed the mandate system in the Middle East. They created a structure for modern states based on the subordination and forced cohabitation of different social groups. Irak, for example, was formed by the Ottoman provinces of Baghdad, Basra, and Mosul, all nearly self-sustainable before colonization. The forced coexistence of created a conflictive and fragmented state.  

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

6 units. ab and lo are congruent sides, and if ab= 6 units, then lo would be the same.