The U.S. Dollar Index, which measures the value of the United States dollar against foreign currencies, has reached its highest level in over four years. For a long time, the dollar has been the world’s top business currency. However, the struggling recession had caused many to question the dollar’s “safety” as an investment. With this new high though, America is regaining its strength and showing its economic improvement compared to the rest of the world. At the same time, the Euro and Japanese Yen have been getting weaker due to these countries’ economic problems.