Back in the day, God's people all spoke the same language. They decided to isolate themselves in a tower to retain complete control. God had other plans. Maybe everyone speaking the same language is still not a good idea.

Genesis 11:9
Therefore its name was called Babel, because there the Lord confused the language of all the earth. And from there the Lord dispersed them over the face of all the earth.
Bible Gateway link: Genesis 11:9 (ESV)