Why did Kazakhstan become the most contributing republic when the Soviet Union defeated Germany in World War II?

Why did Kazakhstan become the most contributing republic when the Soviet Union defeated Germany in World War II?
On May 9 every year, Kazakhstan holds various forms of commemorative activities.

the Soviet Union was able to win the Patriotic War at great cost for many reasons. In addition to the active production of weapons by Soviet industry, the fighting spirit of the Soviet army and people, and the support of the allies, there is another very important reason to pay attention to-- the active cooperation of the Soviet republics with ethnic minorities as the main body. Of all the republics that supported the Soviet Union in winning the Patriotic War, why did Kazakhstan become the most contributing republic?

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