At the Forbes Self-Made 250 Celebration, Steve Sims highlighted how America's greatest achievements have been driven by collaboration, emphasizing the role of public-private partnerships in shaping the nation's past, present and future. ⁣⁣⁣⁣⁣ ⁣ Photo: Jamel Toppin for Forbes⁣⁣⁣ ⁣ ⁣#Forbes250