How do East Asia's rivers contribute to the region’s economic development?

The Rivers in East Asia contribute positively to the agricultural Sector of this region. Combining the rivers with their climate, this region became the perfect place for growing crops such as rice and Soybeans.

Explanation:

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i think its the outcome of people's preferences.

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.