Who had made the first smg?

The first submachine gun (SMG) is widely credited to Italian designer Giovanni Caprini, who developed the "M1910" in the early 1910s. However, the most recognized early SMG is the German MP 18, designed by Hugo Schmeisser and introduced in 1918 during World War I. The MP 18 played a significant role in the evolution of automatic firearms, paving the way for future submachine guns.