President William Howard Taft's foreign policy encouraged American investment in foreign countries and increased trade. What was the name given to Taft's foreign policy?

It was called Dollar diplomacy

Explanation:

President Howard Taft's Dollar diplomacy was a form of foreign policy that advocated for the reduction of threat or military force but to further it's goals in Latin American countries and east Asia through the use of economic power. This was to be done by guaranteeing loans that were made to foreign countries. Dollar diplomacy ensures that a region was financially stable while protecting and extending the United States commercial and financial interests in that region.