Resistance in Iraq

Lately i've noticed that in Iraq more and more fighting has occured. Why do you think it is, that lately there has been more resistance in Iraq? Could it just be because of anniversary of the war in Iraq? What do you guys think it could be?

I have a strong feeling of forboding here.I think what is happening now is the prelude to something bigger to come.
I can see hundreds of thousands of fanatical muslims from all the surrounding countries pouring across the border in Iraq while the coalition forces are spread around as a result of these uprisings.