Which two primary sections divide the ISS structure logically and architecturally?

Answer

Russian Orbital Segment (ROS) and US Orbital Segment (USOS)

The station is structurally and logically divided into the Russian Orbital Segment (ROS) and the US Orbital Segment (USOS), reflecting the initial compromise where each retained jurisdiction over its elements.

Which two primary sections divide the ISS structure logically and architecturally?
SpaceISSspace explorationInternational Cooperation