During the early twentieth century, the nation’s century-long isolation from european conflicts increased.

This is a true or false question and the correct answer here is that this statement is in fact false.

Here we are talking about the United States of America and the their long policy of isolationism did not increase but it did in fact end. The US had long fallowed the Washington's advice of non-interference and the Monroe Doctrine but the WWI and the WWII forced the US to take more active role in the world politics and affairs.

Where are the statements, only the paragraph is here