Why Japan Viewed the U.S. as a Threat in Asia

Key Factors (Late 19th – Early 20th Century)

1. Economic Rivalry

U.S. industrial growth and "Open Door" trade policies challenged Japan's ambitions for regional economic hegemony and resource control (Manchuria, China).

2. Naval Competition

American naval expansion (Great White Fleet, 1907; Two-Ocean Navy Act, 1940) threatened Japan's goal of Pacific naval dominance.

3. Discriminatory Immigration Laws

The Chinese Exclusion Act (1882), Gentlemen's Agreement (1907), and Immigration Act of 1924 (Japanese exclusion) were seen as racial insults and barriers to Japan's international standing.

4. Diplomatic Friction

Disputes over Korea, Manchuria, and China (e.g., Twenty-One Demands, Lansing-Ishii Agreement) created mistrust.

5. Ideological & Geopolitical Clash

Japan's militarist expansion (Manchuria 1931, full-scale China invasion 1937) directly opposed U.S. interests in Chinese sovereignty and Pacific stability, leading to embargoes (oil, steel) and ultimately Pearl Harbor.