LEAGUE OF NATIONS: KAPAYAPAAN, WOODROW WILSON, MAIWASAN ANG PANIBAGONG DIGMAANG PANDAIGDIG, COLLECTIVE SECURITY, HINDI PAGSALI NG U.S.A, SPANISH FLU: INFLUENZA, KALUSUGAN, QUARANTINE, MASKING, HEALTH WORKERS, GREAT DEPRESSION: PAGBAGSAK NG EKONOMIYA, FRANKLIN D. ROOSEVELT, SOCIAL SECURITY, WPA PROJECT, PAGPAPALAKAS NG INDUSTRIYA,

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