And it is because of China that the USA has so many bases within South Korea, even today, the Japanese island of Okinawa, mainland Japan................................it was all about China..........and why i believe was one of the main reasons the USA entered the civil war in Vietnam..............

The Chinese Intervention

3 November 1950-24 January 1951

They came out of the hills near Unsan, North Korea, blowing bugles in the dying light of day on 1 November 1950, throwing grenades and firing their "burp" guns at the surprised American soldiers of the 8th Cavalry Regiment, 1st Cavalry Division. Those who survived the initial assaults reported how shaken the spectacle of massed Chinese infantry had left them. Thousands of Chinese had attacked from the north, northwest, and west against scattered U.S. and South Korean (Republic of Korea or ROK) units moving deep into North Korea. The Chinese seemed to come out of nowhere as they swarmed around the flanks and over the defensive positions of the surprised United Nations (UN) troops. Within hours the ROK 15th Regiment on the 8th Cavalry�s right flank collapsed, while the 1st and 2d Battalions of the 8th Cavalry fell back in disarray into the city of Unsan. By morning, with their positions being overrun and their guns falling silent, the men of the 8th Cavalry tried to withdraw, but a Chinese roadblock to their rear forced them to abandon their artillery, and the men took to the hills in small groups. Only a few scattered survivors made it back to tell their story. The remaining battalion of the 8th Cavalry, the 3d, was hit early in the morning of 2 November with the same "human wave" assaults of bugle-blowing Chinese. In the confusion, one company-size Chinese element was mistaken for South Koreans and allowed to pass a critical bridge near the battalion command post (CP). Once over the bridge, the enemy commander blew his bugle, and the Chinese, throwing satchel charges and grenades, overran the CP.

Elements of the two other regiments of the 1st Cavalry Division, the 5th and 7th Cavalries, tried unsuccessfully to reach the isolated battalion. The 5th Cavalry, commanded by then Lt. Col. Harold K. Johnson, later to be Chief of Staff of the Army, led a two-battalion counterattack on the dug-in Chinese positions encircling the 8th Cavalry. However, with insufficient artillery support and a determined enemy, he and his men were unable to break the Chinese line. With daylight fading, the relief effort was broken off and the men of the 8th Cavalry were ordered to get out of the trap any way they could. Breaking into small elements, the soldiers moved out overland under cover of darkness. Most did not make it. In all, over eight hundred men of the 8th Cavalry were lost�almost one-third of the regiment�s strength�in the initial attacks by massive Chinese forces, forces that only recently had been considered as existing only in rumor.