one could not move between castes in one's own lifetime if born into one level why might the caste system have become more rigid

Plz ive been stuck on this question forever. in 1753 george washington was sent on a mission to a. build a fort at the point where the allegheny and monongahela rivers form the ohio river. b. attack the french at fort duquesne. c. attack the french at fort neccessity. d. deliver a message to the french demanding that they leave the ohio river.

What is one result of the supreme courts decision in the mccullough v maryland case

Who was the leader of the democratic people’s republic at the beginning of the korean war?