Trebuchet
Penultimate Amazing
Certainly. As others have pointed out, Japan was a signatory to the Washington and First London Naval Treaties. These were highly controversial in Japan, as Japan was limited to 3/5 of the tonnage allowed to the UK and USA. The logical reason for this was that the USA had two coasts to defend, and the UK a far-flung empire; while Japan's interests were limited to the Western Pacific.Were there treaty limits on Japan in the 1930s? I'm familiar with the ones imposed on Germany.
More practically, the US had broken Japanese codes in the early 1920's so our negotiators knew in advance the minimum the Japanese negotiators were allowed to settle for. And that was what they got.
As SpitfireX says, Japanese heavy cruisers were probably the most egregious treaty violators. The Mogami class were probably closer to 13,000 tons than the allowed 10,000. And they were introduced as "light" cruisers, meaning they had only 155mm guns rather than the 8.0" allowed to heavies. Fifteen of them, no less. That was because the Japanese were only allowed a certain number of heavies. The USN responded with the similarly armed Brooklyn class, not realizing that the Mogamis had been designed for rapid conversion to 8" twin turrets replacing the 155mm triples, as was done as soon as Japan refused to agree to the 1936 London treaty.
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