Leaders of Patton Boggs and Squire Sanders on Tuesday called their firms’ merger, announced four days ago, a “game changer” built on the ability to represent clients in multiple countries.

As merger talks progressed, each firm flew partners around the globe to visit offices. Patton Boggs partners looked at about half of Squire Sanders’ offices, and Squire Sanders’ lawyers spent time at all but one of Patton Boggs’ offices. The trips helped solidify the relationship between the two firms, according to Thomas Hale Boggs Jr., a Patton Boggs founding partner and the new firm’s chairman emeritus.