Completar frases North and South KoreaVersión en línea North and South Korea por Sonic ThePowerful 1 full civilians retaliate scale broadcast anxiously issued refrain peninsula The Korean war began on June 25 , 1950 , when some 75 , 000 soldiers from the North Korean People ? s Army started to propaganda . By July , American troops had entered the - war on South Korea ? s behalf . Prior to that , the leader of South Korea an ultimatum : " If you don't stop broadcasting propaganda , we will be forced to " . After some early back - and - forth across the 38th parallel , the fighting stalled and casualties mounted with nothing to show for them . Meanwhile , American officials worked to fashion some sort of armistice with the North Koreans . The alternative , they feared , would be a wider war with Russia and China ? or even , as some warned , World War III . Therefore , both sides had to from further military conflicts . Finally , in July 1953 , the Korean War came to an end . In all , some 5 million soldiers and lost their lives in what many in the U . S . refer to as " the Forgotten War " for the lack of attention it received compared to more well - known conflicts like World War I and II and the Vietnam War . The Korean remains divided today .