It is the experimentalism view that all knowing takes this form whether the knowing is in science, art, history, whatever. However, in history one is not permitted to test out each suggestion in direct experience. For instance, the only way to really know what it is like to jump off of the Golden Gate Bridge in San Francisco is to jump. However, the consequences are too dire to test it. Only seventeen people out of over a 1,000 who have jumped have lived and I am not sure whether they have testified to what it is like to jump.
Truth is what works.
The ultimate test of truth is whether the hunch or hypothesis which is tried out and acted upon really works. In the degree that it performs this duty it is said to be true. Hence, truths are always true in degrees, always true contingently or relatively. They may seem to work better in some circumstances than others. Thus, the entire knowing process is an open-ended, ongoing, restless activity that is never permanent and never settled.