X-Plane 11 Global Scenery: North America is a free DLC that you can activate thru your Steam Client. It will give you the default North America Scenery.

About X-Plane 11

X-Plane 11 is the detailed, realistic, and modern simulator you’ve been waiting for.

A completely redesigned, intuitive user interface that makes setting up and editing your flight a breeze.
Consistently usable 3-D cockpits and stunningly high-resolution exterior models for all included aircraft.
A new effects engine for lighting, sounds, and explosions.
Realistic avionics: all planes are IFR-ready right out of the gate.
Busy, “living” airports with pushback tugs and roaming fuel trucks, able to service both your aircraft and the simulator’s AI planes.
New buildings & roads to better simulate European cities
…and more!