<em>Answer:</em>
<em>discriminative stimulus </em>
<em>Explanation:</em>
<em>In psychology,</em><em> the discriminative stimulus is determined as one of the precursor stimuli that is supposed to have a stimulus control over a specific behavior due to the fact that the behavior was formerly reinforced in the presence of that particular stimulus in the past. In other words, it tends to set the event for specific behaviors that have already been reinforced in its presence in the "past".</em>
<em>As per the question, the mentioned statement represents the discriminative stimulus.</em>
Began to claim land in North America
