1453 was when Constantinople, the capitol of all Christendom (a superset what we call the "West" now, which at one point included all of Europe and northern Africa), was taken by Muslims and renamed to Istanbul.
Discussion
Recommended reading: Raymond Ibrahim's "Sword and Scimitar"
Istanbul was Constantinople
Now it's Istanbul, not Constantinople
Been a long time gone, oh Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks
Fair point, this was one of my thought process that time but I should have added other too they had huge impact on us, it becomes complicated quickly 😃