Who invaded constantinople in 1453?

the government closely monitored its finances to avoid another financial collapse.

the word that best sums up the tone of the newspaper regarding the treaty of versailles is resentful.

can someone me with this question:  

1) the end of the conflict between the north and the south didn’t just mark the end of a war; it marked the end of an entire way of life.” which statement best describes what this statement means?  

a) the southerners were no longer free and were controlled by the northern states.

b) the industrial economy in the north was not sustainable.

c) slavery became illegal, which changed completely the south’s labor force and the agricultural economy was destroyed.

d) the states decided to relinquish their independence and return to britain’s rule.    

they became hereditary because there weren't many jobs for people in lower classes