Mining and cattle ranching help prepare western territories for statehood by : Creating large industries that attract people to move to the west.
These industries provide a lot of job opportunities because it need a lot of manpower to keep up with the production
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if only person was in charge of a government, it would gradually convert into a dictatorship, simply because there are no other branches of the government to keep the executive government in check. This is why governments have three branches, to make sure power is balanced. Two branches and even four branches wouldn't work because of uneven balances in power.