Answer :
Final answer:
The Schengen Agreement enables free movement across European borders, promoting intra-European mobility.
Explanation:
The Schengen Agreement is the treaty that allowed European residents to move across international borders with few formalities, promoting intra-European mobility. It was signed in 1985 to abolish checks at shared borders and create a single external border, facilitating the free movement of people within the Schengen Area. The agreement has expanded to encompass most EU states and some non-EU members, creating a significant shift in European geopolitical history.
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