IQ has plateaued or gone down for some western countries while continuing to rise elsewhere (shitty table copy but search for it in the link to read):

Country Peak Gain Period Reversal Detected? Approximate Reversal Date Source Basis Norway 1954–1995 Yes ~1995 Military conscript data Denmark 1959–1998 Yes ~1998 Military conscript data France 1949–1999 Yes ~1999 National assessment data United Kingdom 1950s–2000s Partial ~2000s Multiple study sources United States 1932–1990s Plateau ~1990s Normative restandardizations Netherlands 1952–1980s Unclear Debated Wechsler norm comparisons Kenya 1980s–2000s No

https://neurolaunch.com/rise-in-average-iq-scores-over-the-20th-century/