Earlier quoted context omitted.
We do not have any influence on which side of the line we are born : that's purely luck.
if you believe in genetics/evolution it's not luck. The smarter and stronger side wins. Is it luck that you weren't born as a squirrel or some other animal? My family members fought in wars, paid taxes, and helped build up the country so their descendants could have a better life, calling that nothing but luck is disrespectful to the sacrifices they made.
But you yourself did not have any control over where or when you were born. Even your parents' say in that matter was likely limited.
Also, statistically, birthrates are higher in less developed countries with worse living conditions.