Final answer:
Constructivism became an international design style through the efforts of artists like Vladimir Tatlin and El Lissitzky, who spread their ideas through influential works and publications, affecting movements like Bauhaus and the De Stijl movement.
Step-by-step explanation:
Constructivism was transformed into an international design style by various Russian artists and architects collaborating and spreading their ideas through exhibitions, publications, and teaching.
The foundational work that captured attention was Vladimir Tatlin's Monument to the Third International in 1919, which inspired the exchange of ideas between Moscow and Berlin.
Visionaries like El Lissitzky were crucial in propagating 'Construction art' internationally with the Soviet-German magazine Veshch-Gegenstand-Objet and the 1922 Russische Ausstellung in Berlin.
Constructivism soon influenced major modern art movements, including the Bauhaus and the De Stijl movement. It affected many fields such as architecture, graphic and industrial design, and theater.
The International Style in architecture also drew some of its attributes, such as simplicity and functionality, from Constructivist principles.