@ LV101 - Satan ruled the world by means of the sin nature that was passed down. After Jesus died, a new creature appeared on the earth. One that had never before been seen. A human being with a dual nature. A fleshly sin nature AND a sinless spirit nature, hence the term born again.
When I grew up, all I ever heard my family talk about was how Satan was in total control of the governments of the earth. They reasoned: How else could Satan have offerd them to Jesus?
But here, after Calvary - scripture says Jesus is the ruler of kings.
Jesus Christ, who is the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth. - Rev. 1: 5
To what extent he allows them to proceed with wickedness, or cuts short their reign and so forth, I don't know.
But, one thing is for sure, Jesus is ultimately in total control.