I'd be eager to hear your explanation as to how this is the West's fault, or at least it's contribution.
I mean, it's an incredibly long history, but to footnote, it's worth nothing the very partition of Korea was arbitrarily decided by members of the US State Department who were worried about a Korea in the Soviet sphere of influence. The subsequent war saw the North get absolutely levelled, becoming the most bombed country in history at the time, with pretty much every significant building destroyed and killing up to 20% of its population. The psychological effect of this was enormous (and the North has maintained a significant military budget, especially after the Indonesian genocide of the 1960s); the economic effect is still felt to this day. Nonetheless, up until the 1970s, North Korea was doing the better of the two Koreas.
This began to slow by the 1980s, and things became dire after the USSR collapsed in 1991 and the North was left with China as its only major ally. Floods in the mid-1990s led to famine. There was a potential for breakthrough for peace and maybe even reunification in 2000 with Clinton as President (you may remember a united Korea Olympic team in Sydney in 2000), but Bush put an end to that and put further sanctions on the North to ensure they remained in poverty. A similar opportunity in 2018 between Kim Jong Un and Moon Jae-in was torpedoed by an initially supportive Donald Trump who got cold feet when he listened to his warmongering advisors.