Did the korean war serve any purpose? was part or all of it just a mistake? what were the "results"? how much responsibility should truman bear for the Korean War?

The Korean war had a purpose but it had largely failed.

Explanation:

Truman can and cannot be blamed for the war as he had formulated this policy of attacking in per preemptive measures to control the spread of communism that had plagued the US for so long.

At the same time the nature of the policy was such that it has led to the development of the US in certain senses.

So, as all things in history it is a two way thing and often based around the perspective one has of things.

The war itself was not a success in terms of containing communism as North Korea was out of grasp.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.