God has always ruled and reigned over the earth...Psalm 24:1. Further evidence...Daniel 4:35. I could go on. God is in control of history. History is following a divine plan and is on a divine timeline. The purpose of history is the unfolding of the kingdom of God in the earth.Jesus Christ is currently ruling SPIRITUALLY. He returns to reign over the earth PHYSICALLY AND LITERALLY before the Kingdom of Heaven comes down and for all to share in His Glory.
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This was the plan from the beginning. God made man in His image and tasked him with the responsibility of multiplying and filling the earth. The idea was that as man multiplied the image of God throughout the earth, the glory of the knowledge of the Lord would fill the earth. When sin entered in, the image of God was marred in man, making this goal impossible with man in such an estate. Hence, God sent Jesus to redeem fallen man so God's original intention would come to pass. And it is. It started small, but like a mustard seed, the kingdom of God is growing and will one day fill the earth with the knowledge of the glory of God. The One overseeing all of this is Jesus.
To say He is simply spiritually ruling and reigning is false. He is actively proliferating the kingdom by building His church and nothing is hindering Him. The kingdoms of this world are becoming the kingdoms of our God and of His Christ...Revelation 11:15. God has chosen to do this slowly and progressively throughout history. Though 2,000 years of history has transpired and there are millions more Christians now than when the church began, the church is still in its infancy and it will continue to grow until it consumes all the other kingdoms and the knowledge of the glory of the Lord fills the earth.
God is, and always was, in control of all things.