How did they screw up the middle east by creating countries? Almost all of the borders in the North of the Middle East are the same as they were 1000 years ago,

How did they screw up the middle east by creating countries? Almost all of the borders in the North of the Middle East are the same as they were 1000 years ago, barring the size and influence of Turkey and the break up of the Levant (which was largely a good move). South Middle East has it's issues, sure, but they're mostly political/religious than anything else and have to do with oppression rather than borders.