That's a funny way to twist it. US is providing aid to Israel. Billions a year.
US also provides indirect aid, through protection or aid to neighbouring countries (e.g Jordan and Egypt) as bribes so they play nice with Israel.
And who knows, with the way the Iran thing is panning out, you might be paying a lot more if US decides to bomb Iran on Israel's request
If the US starts sending proportional military aid to South Korea (fertility rate of 0.75 vs Israel's 2.83) it will not "fix it".
The US provides and provided a ton of assistance to Israel but there’s a tendency online for people (probably mostly Americans?) to assign credit to literally everything that happens in Israel to US aid.
Israel exists outside of US-Israel politics and not everything (like birthrates) that happens there is because of the US. The US also supported/aided a lot of other countries that didn’t experience the same economic/industrial/technological development that Israel has in the last 30-40 years - some of it really is because of Israelis’ efforts and not just because of Americans’.