Question

by july of 1950, even with the help of us troops, north korean forces had pushed south korean forces as far south as
inchon.
pyongyang.
pusan perimeter.

Explanation:

In the Korean War, by July 1950, North Korean forces, despite US troop support for South Korea, had pushed South Korean forces to the Pusan Perimeter. The Pusan Perimeter was a defensive line around the city of Busan (Pusan) in South Korea. Inchon was the site of a later US - led amphibious landing. Pyongyang is the capital of North Korea.

Answer:

Pusan Perimeter.