Four interlocking drivers:
China (400M+ people) and Japan (30M+) wanted U.S. cotton, machinery, kerosene, flour. "Open Door" policy (1899) aimed to keep Chinese markets open to all.
Rubber (Malaya, Indies), tin, timber, hemp, sugar, copra, minerals—essential for U.S. industry.
Surplus capital sought returns: railroads (Chinese Eastern, South Manchuria), mines, utilities, banking (International Banking Corp.).
Coaling stations (Hawaii, Guam, Philippines), naval dominance (Mahan's thesis), exclusion of rival powers. Business lobbies (e.g., sugar planters) drove annexation of Hawaii (1898) and Philippines (1899).
Together, these forces made Pacific expansion a consensus goal for U.S. industrial and financial elites by 1898.