The United of States of America has greatly influenced international relations. Throughout United States history, the government has been involved with other countries. For some countries, this relationship was beneficial and others may not have viewed the relationship positively.
Much of the land acquired by the United States gained from other countries. For example, the Louisana Territory was purchased from France. Alaska was purchased from Russia.
The United States also had a tremendous effect on other countries by its involvement in international conflicts, such as World War I and World War II.