Answer:
The decision to remove references to slavery was political necessity. Those who drafted the Declaration believed that it was better to remove the section dealing with slavery than risk a long debate over the issue of slavery. They needed the support for independence from the southern states.
International trade enables specialization, which brings increased efficiency and greater competition to spur the market.
This happens because Specialization would make each nation to focus on producing certain type of products in which they would gain a competitive advantage towards other (either because they had the necessary materials sources or labor qualities) and would create better and cheaper product in the market.
