Why did trade group like that hanseatic league form?

Trade groups like the Hanseatic League formed to promote and protect the commercial interests of their member cities, primarily in Northern Europe. By collaborating, these cities could secure trading rights, reduce piracy, and establish favorable trading conditions, such as standardized weights and measures. The League also provided a collective defense against external threats, helping to ensure economic stability and prosperity for its members. Overall, it facilitated trade and fostered economic growth in the region during the late Middle Ages.