Why did the huns retreat from italy in 451?
a.
their leader, attila, had died, and their new leader wanted to return home.
b.
pope leo i asked them to, and they were weakened by disease and poor food supply.
c.
they were forced out by visigoths.
d.
they did not find what they needed.

The correct answer is - B. Pope Leo I asked them to, and they were weakened by disease and poor food supply.

It is debatable about the reasons for the Hun's retreat from the northern part Italy, but the most commonly accepted theory is that Pope Leo I took things into his own matters and went on to meet Attila in order to convince him to make peace, not war with the Romans, and somehow he managed to do it. Also, very common theory is that the Huns suffered from famine, and that it was another big reason why the Huns returned to the plains of Eastern Europe.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.