Signs point to North Korea unilaterally launching the invasion. It was not helpful for the USSR and was at a very bad time for the PRC since the war immediately shut down plans to invade Taiwan.
The U.S., especially after Chinese troops entered the war, viewed it as a united and aggressive communist bloc brashly taking over one more country and likely to try more if not resisted. US defense spending shot back up to wartime levels (though far from the WWII peak) and stayed there.
China also viewed it as a feeler for aggression that would go further if not resisted. Both countries were overinterpreting local issues as global ones.
The dramatic reverses were all in the first year, followed by two years of stalemate before the armistice.
<span>The collapse of Reconstruction ended African Americans' hopes of being granted their own land in the South. Instead, many returned to plantations owned by whites, where they either worked for wages or became tenant farmers, paying rent for the land which they farmed.</span>
The French and Indian war tool a lot of lives indeed than the American Revolution. It also involved a lot of countries, but the one that lost the most was France as they were able to lose their foothold in 1760.