The foreign policy of America until the end of the 19th century can be described as isolated. Hence, option D holds true.
What is a foreign policy?
A policy revised by every nation with respect to the maintenance of its relations with the other countries for trade and other activities is known as a foreign policy.
The American foreign policy was isolated until the end of the 19th century, as it grew to the greatest extents only after the beginning of the Industrial Revolution, and today has become the most important foreign policies in the world.
Hence, option D holds true regarding the foreign policy of America.
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