Let's just say somehow Western countries kept a steady birthrates and had no need for migrants to fill the gap, and had tight immigration policy. How the West would look today as 99% White and Christian? How would that change the many events that happened throughout this period, from the cold war, the gulf war, the Arab spring etc... And how would that affect the rest of the world?

Why is there a NEED to fill the gap in the first place?

>>510281638 (OP)
>somehow Western countries kept a steady birthrates and no need for migrants to fill the gap
Mass immigration has nothing to do with birth rates dumbass. It predates fertility decline and even when a country is bursting at the seams with people, like mine, it continues unabated
It's race war plain and simple

>>510281638 (OP)
We would already be on Mars and interstellar colony ships, earth would be a bad memory we left behind

>>510281638 (OP)
You'd be living like animals with unwashed bodies, eating raw potato and unseasoned pig. Your hospitals would be falling apart with doctors and nurses, your old people would be dead with noone to care for them.

>>510281638 (OP)
>Let's just say somehow Western countries kept a steady birthrates and had no need for migrants to fill the gap
Fill what gap? It's a totally arbitrary notion that we must have a massive over supply of labour never ending GDP growth and large populations.