What is the significance of the date 1516 and 1798 in middle east history?

[ChocolateMilkIsMyFAv]

columbus discovered america in 1516 and the declaration of indepence was in 1798??? lol

 

[Catch 22]

I need to know this for a history course. I think it may have something to do with Ottoman control but I am not completely sure. Can someone please clarify? Thanks in advance will reward answer