United States has the largest international trade in the world. This has been the leader in international trade as the greatest imports and as one among the leading exports. It is the leading consumer among world nations and hence this is the greatest customer for almost all companies in the world. This is why world business competes to get some share in the US market.
The US international trade has caused a situation where in the US dollar is circulating largely around the world. Since US economy and its monetary policy has caused a faith and trust in the other countries of the world, US dollar became the legal currency for many nations.
