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The countries in North America each import and export different products. The United States exports to countries on every continent. Why is this possible?

The United States is rich in natural resources that can be used in many different ways.
The United States has access to railroads, making transportation cheap and easy.
The United States has power over other North American countries and regulates their trade.
The United States is centrally located and is closer to all the continents than any other country.

The tower commission, appointed by president reagan in 1987 to investigate how the iran-contra affair had happened, concluded that most of the blame lay with a. president reagan himself, for careless management of his subordinates b. congress, for poorly drawn legislation that failed to define carefully the role of the president's national security council c. the american people, for failing to pay attention to the conduct of international affairs d. the federal courts, for having allowed excessive power to flow to the executive branch