If you compared Finland to only white students in the USA you'll see one result, if you compare to only black students you'll see very different results.
We in the US have never even tried that for anyone but our wealthiest, let alone our poorest.
If we took this problem seriously on a federal level, and put all our options on the table, we absolutely could fix it.
Of course, then there are the systemic/societal reasons you allude to. In America having a child for many people means losing your job and your health care. In Finland they give you a year off and a complete wardrobe for your kid. In Finland they ended homelessness entirely. In America at this very moment they are debating on the senate floor whether repealing eviction moratorium would incentivize single mothers to get a job. There's really no comparing.
[0] https://finance.yahoo.com/news/much-teachers-around-world-wh...