The correct answer is true.
It is true that the US became more active in international affairs because it was looking for new markets to sell its industrial goods.
The United States is always looking for the best trade deals to sell its goods. That is why, as a free-market economy- has signed important trade agreements such as NAFTA, the North America Free Trade Agreement that was signed by Mexico, the United States, and Canada. This agreement has been revised by Congress of the three countries, modernized, and now has a new name: USMCA, the United States, Mexico, and Canada Agreement.