Question

what stopped the advance of the north korean army on august 4, 1950?
american forces pushed north korean troops north of the yalu river.
south korean and american troops created a perimeter around the town of pusan.
general macarthur landed in the bay of inchon to push back north korean troops.
united nation forces defeated the north koreans at the battle of hill eerie.

Explanation:

By August 1950, North Korean forces had advanced far into South Korea but were halted when South Korean and American troops established a defensive perimeter around Pusan, known as the Pusan Perimeter. MacArthur's Inchon landing happened later in September. Pushing North Korean troops north of the Yalu River also occurred later and was part of a larger offensive. There is no well - known "Battle of Hill Eerie" in the context of the Korean War's early stages.

Answer:

South Korean and American troops created a perimeter around the town of Pusan.