Even though the byzantine empire fell in 1453 and was in decline for centuries before
that, it left a strong legacy behind. what was the most important contribution that
byzantine made to world history? why is that most important?

Preservation of Greek arts and literature.

Explanation:

Without the Byzantine Empire, most of Greek literature, art and cultures, and maybe the ancient Greek themselves would've been lost in history.

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.