How did slavery with america's economic growth?

Back in the 1700's the slave trade was almost as popular as the production of smartphones today. Every one wanted a servant so the economy grew. when it was proposed to abolish slavery, many did not want it to go because they were afraid that the economey would drop.  

Idon’t google

It should be at the center of any map going vertically: the prime meridian, as it passes through greenwich,  england, is considered 0 degrees longitude