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G. POWER TRANSITION: CHINA/US RELATIVE POWER & PARITY (ratio, 1=parity)
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  CINC composite     2000=1.14 2010=1.42 2016=1.73 2023=nan | parity from 1860
  GDP (PPP)          2000=0.37 2010=0.84 2016=1.04 2023=1.28 | parity from 2014
  GDP (market)       2000=0.12 2010=0.41 2016=0.61 2023=0.67 | parity from None
  Military spending  2000=0.07 2010=0.15 2016=0.32 2023=0.34 | parity from None

  US share of 8-great-power GDP stays ~40% (1990:41% -> 2023:41%); China 2%->27%.
  => 'US decline' is RELATIVE TO CHINA and measure-dependent: parity reached on PPP/CINC (~2014/1990s), NOT on market GDP/military.

Dissatisfaction/contestation proxies: active strategic rivalries 2000=74 2010=51 2020=56
  US-China strategic rivalry on record: True (type: positional/ideological)
  Active armed conflicts (UCDP): 2005=33 2014=46 2023=59

Descriptive alignment 2008-2024 (entering the parity zone):
  corr(China/US PPP power ratio, global FreeScore) = -0.52 (negative: closer to parity, less democracy)
  corr(China/US PPP power ratio, active conflicts) = +0.83